CN1047822A - Power tool - Google Patents

Abstract

One portable power tool, comprise a cover, an erecting device of a selected tool heads from a plurality of tool heads is installed in a driving mechanism and confession, wherein is provided with an output device in this cover, this device is suitable for driving an output shaft, makes it produce reciprocal axial motion to drive a selected tool heads.

Description

Power tool

The invention relates to power tool, especially about but non-specially quite light and be fit to the popular power tool that uses about weight.

There are several power tools to be widely used in skillful with one's hands person's the market of taking action on one's own to do, for example dynamic brill of this instrument, saw and analog.Yet, relate to the work that destroys stiff materials (as cement, slab, stone or even heavy soil piece) and be difficult for powerful or industrial instrument (for example a strength is bored) anything solution in addition.

The present invention further provides a portable power tool, comprise a cover, a driving mechanism and supply to install an erecting device of a selected tool heads from a plurality of tool heads, wherein be provided with an output device in this cover, this device is suitable for driving an output shaft, makes it produce reciprocal axial motion to drive a selected tool heads.

This driving mechanism is preferably a linear motor.Perhaps, this driving mechanism can be a turning motor that needs a device to get involved, and this device can be a cam gear, converts axially reciprocating in order to rotatablely moving.

Thereby a cylindrical cam that rotates with this motor output shaft can be set easily, this cam is provided with a sinusoidal cam track that extends around its peripheral surface, be suitable for participating in reciprocal axial motion driving an output shaft of a selected tool heads, and be suitable in this cam rail, moving and this reciprocal axial motion passed to the cam follower mechanism of this output shaft.

This cylindrical cam can be selected from a plurality of cam members easily, and these members have a traverse scope.

In case of necessity, can between this motor and this output shaft, the center tooth wheels be set.This motor uses a transformer, accepts electric power from a main line, or with some battery-operated.These batteries can with desired be rechargeable type or replaceable.In an example of the present invention, these power brick are contained in the separable battery/handle module, in order to quick replacing.In another example, mains electricity is provided by a separable cable, and is provided with a battery pack, for using when this electrical cables separate.These batteries can be the rechargeable type battery easily.

Several embodiment of apparatus of the present invention are described now, and we will understand these embodiment and only have effect for example and unconfined effect.

In each accompanying drawing:

Fig. 1 is the outside drawing according to an instrument of the present invention;

Fig. 2 is the middle magnification ratio longitudinal sectional view partly by instrument shown in Figure 1;

Fig. 3 is along the cutaway view that III among Fig. 1-the III line is got, but does not comprise the power drill mounting points;

Fig. 4 is the perspective view of an engine casing (Eng Cas) end cap;

Fig. 5 is the cutaway view along V among Fig. 1-the V line is got;

Fig. 6 is the perspective view of engine casing (Eng Cas);

Fig. 7 is the perspective view of motor supplementary bearing;

Fig. 8 is a supplementary bearing thrust bearing;

Fig. 9 is the perspective view of a cylindrical cam;

Figure 10 is a cam thrust bearing;

Figure 11 is the perspective view of a hollow actuating shaft of this instrument;

Figure 12 (a) to (c) shows each cylindrical cam with various sizes;

Figure 13 is the cutaway view along X III among Fig. 2-X III line is got;

Figure 14 shows a substituting tool heads that is applicable to instrument of the present invention;

Figure 15 shows the situation of hand-held instrument of the present invention;

Figure 16 shows the pattern of the instrument of Figure 15 with battery charge; And

Figure 17 a to d shows each substituting tool heads that may be used in instrument shown in Figure 15;

Figure 18 is the part cutaway view according to a power shovel of the present invention;

Figure 19 a-19b is the similar view of a portability cutter;

Figure 20 to 28 shows various alternative designs and the change according to each utensil of the present invention.

Fig. 1 shows that according to an instrument 2 of the present invention, its is fit to and first use of various tool, but in the present embodiment is to use with a drill bit 4.

This instrument comprises one handle 8, and this handle comprises the trigger grip part 8 of operation via a cable 10 supply capabilities.This handle is fixed in motor 14(Fig. 2) a cheese end cap 11 of cover 12 on.Cover 12 is provided with air drain seam 16, and can be configured to one of two kinds of sizes according to its purposes, also promptly constitutes long cover or short cover.One tubulose shell 18 extends from this cover, and a button to hold the axle collar 20 outstanding from this shell, the driving shaft under this axle collar is fixed in and is illustrated in, tool heads 4 is installed in this axle collar.

The structure of this utensil as after.The output shaft 22 of motor is provided with two plat parts, and in a shaping recess 24 that inserts a countershaft 28, the axle collar of this countershaft is resisted against in the thrust bearing 30, and countershaft 26 is installed in this thrust bearing.Thrust bearing is fixed on the shell 18.

One cylindrical cam 32 is installed on the countershaft 26 and with its rotation, this cam has a sinusoidal cam track 34 that is arranged in its periphery.The lower end of countershaft 26 is installed in the thrust bearing 36.Bearing 36 is shown among Figure 10, can find out that its outer ring member is formed with tool larger-diameter two part 40 relatively, these partly are fixed on the shell 18 by bolt (not shown) at 41 places, thereby staying two arc-shaped gaps, two extensions 42 of a hollow actuating shaft 44 are outstanding via this two gap respectively.This driving shaft is received in the shell 18, only allows that it produces axially-movable.

Each extension 42 is provided with a hole 46, wherein admits a pin 48 that is suitable for rotating in this hole, and this sells from extension 42 to the track 34 that projects to cam 32.

Motor drives cam 32 rotation, make pin 48 with respect to the central shaft of instrument in moving axially, and this makes driving shaft 44 in complex way in moving axially.This reciprocating stroke is decided by the traverse of this cam rail, and it for example can be selected from each cam shown in Figure 12 a-c, and these cam strokes are respectively 2mm, 4mm and 6mm.

An end piece 50 that is fixed in driving shaft 44 lower ends has external screw thread, holds in the axle collar 20 in order to be received in the head button that surrounds a tool heads (being a drill bit 4 in the present embodiment).4 top is step shape at 52 places, in order to the complementary class 54 on the engagement end part 50.

Can understand this power tool and mainly be intended for use small-scale purposes, for example as cold brill, conduct shovel (shown among Figure 14 58), but also can less form be used as a hand-held instrument use, for example in order to scrape or to shell lacquer, wallpaper or analog.

Figure 15 shows an example of this handheld tool.Though the operating mechanism of this handheld tool only on the ratio be illustrated in different, but the motor in its cover 58 is with battery-operated, it is not to act on 4 via a hollow actuating shaft, but operate one keyway driving shaft 60 is arranged, various tool (shown among Figure 17 62,64,66 or 68) can depend on this driving shaft.The rotation of axle 60 is controlled via suitable train of reduction gears (not shown).Be provided with a finger console switch 70 in this instrument and this utensil is positioned to be connected to a charging base 72 of a charhing unit 74, can be with battery recharge.

Utensil shown in Figure 18 is a power cutter, and it comprises the one handle 76 that has out/close trigger switch 78.In an engine casing (Eng Cas) 82 that is molded as by hard plastic material, be provided with some air drain seams 80.Per minute 10,000 changes with being fit at least for good torque characteristics, selects the rotation 84 via cable 86 supply capabilities.One motor output shaft 88 engages with the pod 90 of an extension of a hollow main shaft 94, and this output shaft is fixed in a supporter 96, and operation in the thrust bearing 98 on.One cylindrical cam 100 converts rotatablely moving of this motor output shaft to vibration (back and forth) motion by the cam follower 102 that is engaged in the sinusoidal waveform cam rail 104.

One tool heads supporting axis 106 is matched with in the main shaft 94 with manner, and its profile reduces the friction between each slidingsurface.For axle 106 end stop 108 is set in this utensil.One tool heads (not shown) has one 110 that can insert in the supporting axis 106, and can be fastened by a ball and socket arrangements 112.

Figure 19 shows a power shovel (Figure 19 b is the part that continues of Figure 19 a).Represent with identical label with each identical among Figure 18 assembly.Motor output shaft 88 is received in the pod of a hollow outrigger shaft 116, and this outrigger shaft is received in the main shaft 118 that is made of a rigidity solid tubes.The lower end that another pod 120 is admitted this outrigger shaft, this pod 120 and a cam cylinder 124 are in aggregates, and the rotation of this cam cylinder moves back and forth each cam follower 126 as previously mentioned, causes the lengthwise movement of cam follower installation shaft 128.

Quill shaft 128 is admitted a support member 130 of the axle 132 of shovel sheet 134.It is sealed by an end cap with each of coaxial manner arrangement.

Figure 20 shows a hand-held utensil that is fit to be used as scraper use (for example being used to scrape wallpaper).One cover 138 encases two interchangeable batteries 140, and these batteries are according to position operation one motor 142 of on-off switch 144.This motor makes a cam follower device 148 rotations via a second order back gear 147.Have towards cam follower 148 and fastened by a cam 150 of the moving partially radial arrangement cam face 152 of spring and can not rotate, thereby participate in a reciprocating motion in axially.This motion makes the wing 154 that is fixed on this utensil at 156 places produce the reciprocating motion of being wished.

Each battery 140 of utensil shown in Figure 20 is chargeable, and by remove end cap 158 can change easily each battery 140 shown in Figure 21 '.Figure 22 shows and to be similar to device shown in Figure 20, it comprise a single-order back gear 147 '.

Figure 23 shows the change of a scraper, wherein by a linear output motor 180 reciprocating motion is passed to one and is subjected to the moving partially member 162 of spring, and wing then is fixed on this member.

Figure 24 shows a scraper, and wherein motor 164 is by the mains electricity operation, and the output of motor shown in the figure is supplied to a cam cylinder 168 via a single-order back gear 166.Also be provided with a transformer 170 in this scraper.

Can understand and have the people and think that also to operate a linear output motor by mains electricity more convenient.Yet, show a dual power supply device among Figure 25, wherein a cable connector 172 can remove from covering 174, and for example in order to deal with inaccessible position, can use one group of reserve battery 176 this moment between short-term.

In design shown in Figure 26, comprise the battery replacement device that makes things convenient for form, wherein each battery 178 and cover 174 ' an end portion become can separate fast one change module, the time delay of finishing desired operation with minimizing.

In claim scope of the present invention, may do various changes.

Claims (14)

1, a portable power tool, comprise a cover, an erecting device of a selected tool heads from a plurality of tool heads is installed in one driving mechanism and confession, it is characterized in that being provided with in this cover an output device, this device is suitable for driving an output shaft, makes it produce reciprocal axial motion to drive a selected tool heads.

2,, it is characterized in that this driving mechanism is a linear motor according to the instrument of claim 1.

3, according to the instrument of claim 1, it is characterized in that this driving mechanism is a turning motor and wherein is provided with cam mechanism, will rotatablely move in order to the longitudinal axis with respect to this output shaft converts axially reciprocating to.

4, according to the instrument of claim 1, it is characterized in that being provided with a cylindrical cam with this output shaft rotation, this cam is provided with a sinusoidal cam track that extends around its peripheral surface, be suitable for participating in reciprocal axial motion driving an output shaft of a selected tool heads, and be suitable in this cam rail, moving and this reciprocal axial motion passed to the cam follower mechanism of this output shaft.

5, according to the instrument of claim 1, it is characterized in that this cylindrical cam is selected from a plurality of cam members, these members have a traverse scope.

6, according to the instrument of aforementioned arbitrary claim, it is characterized in that between this driving mechanism and this output shaft, the center tooth wheels being set.

7, according to the instrument of aforementioned arbitrary claim, it is characterized in that using a transformer, accept electric power from a main line at this driving mechanism.

8,, it is characterized in that this driving mechanism accepts the electric power of a battery according to each instrument in the claim 1 to 6.

9, according to the instrument of claim 8, it is characterized in that this battery comprises one battery/handle module, this module is separable, in order to quick replacing.

10,, it is characterized in that being provided with a reserve battery that is suitable for interim use according to the instrument of claim 7.

11, according to the instrument of claim 7, it is characterized in that being provided with a trunk cable, it can separate with this instrument, and is provided with a battery pack, for using when this electrical cables separate.

12, according to the instrument of claim 4, it is characterized in that cylindrical cam is received in the hollow actuating shaft part, this partly comprises in order to admit each hole of pair of pin, this constitutes this cam follower mechanism to pin, make when this driving mechanism rotation, fastened this axle that can not rotate and move axially in this cover inherence.

13,, it is characterized in that comprising scraper or bayonet, a cold brill or other similar small hand-held instruments of wallpaper or lacquer from this selected tool heads of these groups according to the instrument of aforementioned arbitrary claim.

14,, it is characterized in that comprising a shovel, break ground brill, a cutter or all stone implements from this selected tool heads of this group according to each instrument in the claim 1 to 12.

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