GB2414708A

GB2414708A - Handheld power tool with a detachable handle

Info

Publication number: GB2414708A
Application number: GB0428353A
Authority: GB
Inventors: Shuming Wu
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2004-06-01
Filing date: 2004-12-24
Publication date: 2005-12-07
Anticipated expiration: 2024-12-24
Also published as: CA2491681C; GB2414708B; CA2491681A1; GB0428353D0

Abstract

A reciprocating saw, which also may be described as a jig saw. The reciprocating saw comprises a housing 1, where the housing 1 has a leading housing (fig 2, 7) and a motor housing (fig 2, 2). The leading housing (fig 2, 7) houses a gear system 71, and the motor housing (fig 2, 2) containing a motor 6 therein. A first switch trigger 100 is disposed on a region of the motor housing 2 for activating a first switch 103 within the motor housing (fig 2, 2). In addition, a separate handle 10 is detachably mounted to the housing 1, where the handle 10 comprises a second switch trigger 12 provided for activating a second switch 101 disposed within the motor housing (fig 2, 2). The handle 10 further comprises a lever 16, the lever 16 operably connecting the first switch trigger 100 to the second switch trigger 12. Other features the reciprocating saw include a laser alignment device 4 and a scrolling means.

Description

24 1 4708 {IANDHELI) POWER TOOL WITH A DETACHABLE HANDLE

DESCRIFTWN

CROSS-RENCE! TO ItELATED APPLICATIONS t0001] Aim application claims the benefit of Chinese Patent Application No. 200421027477.Q filed June I, 2004 which is Inca herein by reference.

P13D13RALLY SPONSORED RESEARCH OR DB1tELOPMENT [00021 Not applicable.

CAL PHILD

t0003] Lee present invention relates to an improved popover tool, and particularly to a eciFocating saw wid1 a detachable handle.

BACKGROUND 017 TO INVENTION

4] A conventional reciprocating saw generally comprises a leading portion perpendicular to Tic cueing surface, which mainly comprising gear driven meat's and a reciprocating shaft inside a leading housing, and a motor portion parallel to the cutting surface. A person typically Us a reciprocating saw by grasping He motor housing, or by Cuspid an extra handle disposed on the molar housing. To maintain a find Up and precise control, such a reciprocadog saw is preferably operated by grasping He motor housing.

t0005] However, with extended and continuous operation, the motor housing can become warm, and cutting vibracicos may cause an operabor's hands and anus to become fadgued. As sued the operadag can become uncomfortable, reducing the Philip of the operator to precisely control the cut being Mae. Otherwise, operate a reciprocating saw by grasping a handle is much more comfortable. But when the saw is to be used in tight quarters wherein the handle Bigly become an obstacle to precise control of the cutting tool. When the cutting to be done on the ceiling or some over position which is not horizontal, grasping the motor housing will provide a firm rip and precise control of the cutting.

t000C1 U.S. Patent No. 6,443,615 to Kopras et al. discloses a spiral cutting tool with a detachable handle which includes a trigger switch for operating die cutting tool motor. The cutting tool includes a multipleposition power on/off switch mounted on the tool housing.

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While cutting tools sTch as thoce in Kopras et al. address some of the is8ues described above, there still exist limitations inherent to such systems. For example, the operation of He trigger switch of the device in Kopras et al depends on three different operating position of the multiple-position polka. otuloff switch Accordingly, the system is complex, and subject to mechanical tnalfuncdons.

[00071 The present invention is provided to solve the problems discussed above and other problans, and to provide advantages and aspects not previously provided. A full discussion of the features and advantages of the present invention is deferred to die following detailed description, which prod with reference to the socompanng drawings.

SUMMARY 0P TO VENT[ON

[001 The present invention provides a power tool, especially a reciprocating saw, with a detachable handle, which can be antsily, quickly and securely mounted to the housing and removed therefrom wide one band. Therefore, users can operate the tool with or Hideout the handle optionalb.

IoOO,l The reciprocating saw of the present invcation composes a housing which can comprise a leading housing and a motor housing wherein a motor is positioned for driving a gear system, a saw blade, a sole plate and a handle detachably mounted to the housing. The detachable handle preferably lets two ends, wherein a lug positioned within the from end and can be inserted into a corresponding aperture of the housing for connecting. Clue rear end of the handle includes a pair of grooves and a pair of connector each of which comprises a push button and a protnding portion extends under the bottom of the rear end. At the upper portion of the rear end of the motor housing is a connecting platfonn which comprises a pair of wedging pieces and a pair of IGCY bosses. To mount the handle, a person should guide the wedging pieces in the grooves until Me Icey bosses are matched with the protruding portion.

tOOlOl The reciprocating saw of the present invennon also comprises a first switch, a pole, a frame and a first switch trigger for activating the first cwitchYlle reciprocating saw can further comprise a second switch and a trigging pole The handle comprises a second tedder switch for activating the second switch, a cylindrical shaft fixed in the handle, and a lever pivot through the cylindrical shaft.

t00tt] Me frame mentioned hereinbefore preferably comprises a hole, wherein a locking pole can selectively insert. When the first switch trigger is in its OPP position, the handle can be mounted to e housing. During the mounting of the handle, one of the proding portiOnS of die connector pushes the limiting pole down into the hole of the frame, such that the frame secured, and Me first cwitcb trigger is locked. Conversely, when detaching die handle from Me housing, the locking pole escapes from the hole, and the first switch digger is enabled [00121 The reciprocating saw of the present invention also comprises a bluely clamping device which can be operated without any aid of a cool. The blade clamping device comprises a fixing element, a sleeve, a pair of spangs, and a pair of rollers. The fixing element comprises a cavity for receiving the cad of a saw blade. a teversc-V-shaped groove and a cylindrical bore on the top of the cavity' and a V-shaped groove through toe fixing elect far receiving the rollers. Me inside of the sleeve has a pair of elongate grooves for receiving and guiding two ends of the rollers.

100131 Ttte reciprocating saw may further comprise a sole plate wide a plurality of dust channels. The sole plate includes a base, a sole and a pipe, wherein a groove is positioned in a bosom side of the base When the sole is mounted to the base, two channels are formed thereby. Me dust channels open near the saw blade and connect to the pipe at their n:spective opposed ends.

4] According to one aspect of the present invelltioo, the reciprocating saw with detachable handle comprises two switch [riggers positioned on toe motor housing and the detachable handle respectively for activating the motor.

10015:1 According to another aspect of Me present invention, the reciprocating shiv with detachable handle, wherein once the detachable handle is mounted to Me housing, die switch trigger on the motor housing will be locked and only the one on die handle us operable. So that the two switch trig gers can't be operated simultaneously. and unexpected accident is avoided.

|OOIq According to another aspect of the present invention, the reciprocating saw with detachable handle comprises a sole plate which includes at least one dust chancels which opens near the saw blade and which connect to a pipe at the other end. When in operation, a dust absorption device is connected to the pipe so that sawdust will be absorbed through Me dust channels then.

100171 According to skill another aspect of the present invention, die reciprocating saw is provided, wherein the saw includes a laser alignment device.

[00181 According to yet another aspect of die present invention, the reciprocating saw is prodded, wherein He saw includes an illumination system.

t00191 According to still another aspect of the present invention a pendulum scrolling eciprocadog saw is provided 10020] Other features and advantages of die invention will be apparent from the following specification In in conjunction with Be following drawings.

BRIEF DESCRIPTION OP DIE DRAWII!IGS

1W211 To understand the present inYenuon, it will now be described by way of example, wide reference to Be accompanying drawings in which; FIG. 1 is a partial cross-sectional front view of a reciprocadag saw wide the detachable handle mounted on the housing according to the present invention; FIG. 2 is a perspective view of a reciprocating saw with the User alignment device proJechog a laser beam according to the present invention; FIG. 3 is a partial cross-sectional perspective view of a reciprocadag saw according to the present invention shown with He detachable handle mounted on the housing; FIC; 4 is a perspective view of a preferred detachable handle according to the present invention; FIG. 5 illustrates the inner structure of the detachable handle according to He present invendon, PIG. is a perspective view of a reciprocating saw according to He present invention shown with the handle removed; FIG. 7 is a top view of the reciprocating saw of Pl(;. 6; FIG 8 is a schematic cross-sectional view taller along line K-K in FIC}. 7; PIG. 9 is a front sectional view of a preferred blade clamping device according to the present invendon, PIG. 1Q is a perspective view or the blade clamping device of FIG. 9 shown with a blade; P1Ci. I I A is a perspective view of a sole plate according to He present invention; E7lCi. I I B is another perspective view of a sole plate according to the present invention; PIa I I is a another perspective view of a sole plate according to the present invention; FIG. l2 A is a cross sectional view of a another embodiment of the present invention; and FIG. 12 B illustrates two possible positions of the components shown in die dot line circle of PIG. 12 A,

DETAeD DESCRIPTION

t00223 While this invention is susceptible of embodiments in many different fonns, Here is Clown in the drawings and win herein be described in detail preferred embodiments of the invention with the understanding Cat the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiments illustrated.

t0023] Refemag to FlOS. 1 and 2, a preferred reciprocating saw of the present invention comprises a housing 1. The housing I bss of a leading housing 7, a motor housing 2 a motor 6 and a blade 3. The say also includes a first switch 103 contained within the motor housing 2. A gear system 71 is positioned within the leading housing 7 for transmitting and altering the mtation of die motor shaft to reciprocation of the blade 3 The saw is also comprised of a detachable handle 10, a laser aligrunent device 4, an illuminating device 5, a blade clamping means 30, and a sole plate 20 [0024] Referring to FIG. 4, a lug 14 is positioned within the front Cad of to: handle 10.

We lug 14 may be inserted into a corresponding aperture 140 on the housing 1 for connecting as shown in FIG. 6. The rear and of the handle 10 includes a pair of Connectors 18 biased from each odor by a span" 182 connected therebetween as shown in PIG. 5. Each connector 18 comprises a push button 180 and a protruding portion 184 which includes a slant 186 and a groove 188 and extends under He bottom of the rear end of die handle 10 The handle 10 furler comprises a pair of elongate grooves 48 on the bottom of the rear end. Further refening to FIG. 6, at the rear end of to motor housing 2 is a platform 40 which comprises a pair of opposite wedging pieces 46 and a pair of Icey bosses 42 each of which comprises a slant 44.

10025] In mounting the handle 10, a user will grasp and push the handle 10 so dolt the grooves 48 are guided along wedging pieces 46 and the lug 14 is inserted into, and received

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by, the aperre 140 until the slan 186 of e prouding portions 184 slide over e slants 44 of Me kitty bosses 42 and are loclced within the grooves 188. At that lime, the lug 14 is toughly inserted into the aperture 140, and the handle 10 is fixedly mounted to die housing 1.

[00261 To remove the handle IQ a user will first depress the two push buttons 180 of the connectors 18. This will cause the connectors 18 to retract inwards together with the compression of We spring 182. Accordingly, the key bosses 42 disengage *om We grooves 188. The user may then pull the handle to until the wedging pieces 46 become disengaged from the grooves 48 and We lug 14 is released from the aperture 140 [W271 Refening to FIGS 1 and 2, the n:ciprocating saw comprises a first switch 103, a pole 102, a flame 104 and a Bust svntch trigger 100 for activating die first switch 103. When the fact switch tagger 100 is moved to a first position as shown in FlCi. 2, the triggering surface 1041 of the frame 104 act a foam on We trigger 1031 of the host switch 103 and thus the first switch 103 is switched on and the motor 6 is povvered. Conversely, moving die first switch trigger 100 to a second position wherein the triggering surface 1041 disengages the tremor 1031, causes the first switch 103 to be shut off and the motor 6 to stop rotating.

8] It will be appreciated that a second switch digger 12 operatively positioned on We handle 10 Nay be provided. This second switch trigger 12 provides for convenient operation of the tool when the 1 - nd1e 10 is attached. The handle 10 filrther comprises a lever 16 I;xed win a roller 160 proximate a front end She roller 160 is movable within a pair of elongate aperbares of the second switch trigger 1:L Lee handle 10 also includes a cylindrical shaft 1di2 faced in the housing for pivotally supporting the lever 16.

tO0291 The reciprocating saw may also comprises a second switch 101 as shown ID FIG. 3. AS shown in FIGS. 7 and 8, the second switch 101. comprises a Rigger 101 1, above which is disposed a iggenug pole 130 disposed with its top end slighdy exposed on the platfonn 40. When the detachable handle 10 is mounted to the tool housing I with the second switch trigger 12 on its OFF position, the trailing cad 164 of die Aver 16 is situated above the top end of We triggering pole 130 leaving die spring 131 free. By depressing the second switch trigger 12, a roller 160 will then be raised, and the lever 16 will pivot clockwise around cylindrical shaft lfi2 accordingly. This will c he We Wiling cad 164 to decline and push We tiering pole 130 to switch We second switch 101 to an ON setting.

[00301 In one embodiment of the present invention the reciprocating saw does not include a triggering pole 130 Accordingly, when die second switch trigger 12 is depressed, the Wiling end t64 pushes direcdy on the trigs er IO11 of the second switch 101.

tO031] Ir one embodiment of the invention the reciprocating saw does not include the second Witch 101. Keferung to PICl. 12A, tne tool instead further comprises an active pole 130' whose bottom end has a sharp slant 132, and a resilient piece 133 win one end fixed.

FIG. 12B is a schematic view showing two relative positions of the active pole 130' and the resilient piece 133. According to this embodiment, the active pole 130' and the resilient piece 133 are in their first position when no force is applied to the active pole 130'. Conversely, when the second switch trigger 12 is pressed, the tailing end 164 of the lever pushes the active pole 130' downwards such that the slant 132 slides on and pushes the resilient puke 133 to its second position (illustrated in phantom), wherein the digger 1031 is pushed by die resilient piece 133 and thus the switch 103 is triggered to an ON posidon. If, however, We handle 10 is not attached, when the first svrltch trigger 100 is depressed, me frame 104 will follow to push the resilient piece I 33 and activate the switch.

2] To avoid multiple operations of the two switch taggers, and thus prevent uncxpecd accidents, the reciprocating saw preferably has a function, wherein when the handle 10 is attached to the housing 1, the first switch trigger 100 on the motor housing 2 will be locked in its MULE: position slid only the second switch tags or 101 on the handle 10 is operable As shown in PIG. 3, to achieve such an object, the &me 104 preferably campuses a hole 106 in which a locking pole 110 may be selectively insert tO033] When the tiandle 10 is not mounted on the tool. a span" 111 mmains free, and flu: locking pole 110 is released above the hole 106 as shown in rIa. 8, and the frame 104 can be moved filly to switch ON or 0"' the motor 6, When Me first switch Rigor 100 is in its OFF position, the handle 10, may be mounted to the housmg 1. As illusbted in FIGS. 1 and 3, Owing die mounting of the handle 10 a bottom slant 187 of one of the prodding portions 184 pushes the locking pole 110 dove into the hole 106 such that the frame 104 is hold from moving, and the best switch trigger 100 is locked in its OFF position. Conversely, when the ladle 10 is detached from the housing 1, the locking pole 110 escapes from the hole 106, and the first switch triter 100 is enabled [0034] one embodiment, the reciproeadag saw of the present invention preferably composes a blade clamping device 30 which can be operated without tlu, aid of a tool.

Refering to PIG. 9 and libel. 10, the blade clamping device comprises a fixing clement 32, a sleeve 31, a pair of springs 33 and a of rollers 34. The Rttag element 32 comprises a cavity 320 for receiving an end of the saw blade 3, a reverse V-shaped groove 324 and a cylindrical bore 322 on me tap of the cavity 320 such that the top end 300 of the blade 3 can be fiecdly received. The blade clamping device 30 furler ownprises a Vsbaped groove 326 Trough Acing element 32 for receiving die rollers 34 therein. The sleeve 31 includes a pair of elongate grooves 310 for receiving end guiding two ends of Me rollers 34.

[OQ151 The blade clamping device 30 shown in Fug. 9 is free for receiving a blade. To cop a blade, a user pushes the sleeve 31 upwards causing the roller 34 to run aslant along the V-shaped groove 326. Lee bode 3 is men inserted through the gap of the two lollers 34 until We top end 300 leaches and is received in the cylindrical bore 322. Mine shove 31 is then released. Under the biasing force of the springs 33, the sleeve 31 will run down together with the roller 34 therein. Abe rollers 34 slide along die slant of the V-shaped groove 32G towards the blade 3, and apply a force to the blade 3 thereby to fixedly clamping die blade 3.

tO0361 In one embodimcat of the present invendon, the reciprocating say' further comprises a sole plate 2() wide a pair of dust channels 25'. Refemag to FIGS. 1 IA-I 1G the sole plate 20 includes a base 23, a sole 22 and a pipe 21, wherein a pair of groove 25 is positioned on the bottom side of the base 23. When the sole plate 22 is mounted to to base 23, two channels 25' are formed thereby Each of the dust channels 25' has at least one Opening 24 disposed proximate the saw blade 3. By connecting a dust collector to the pipe 21, stub sawdust may be absorbed alone' the channel. 25' into the dust collector.

t00371 Acceding tone embodiment of the present invention shown in FIG 2, the Ieciprwadog saw comprises an illumination system 5 to illuminate the cuffing area. The reciprocating saw may also include & laser alignment device 4 to project a fan-shaped laser beam 400 which can reflect a visible line on the work piece as a cutting reference, referring to PIG. 2. For enable the alignment dense 4 may be of the type described in China Patent No. ZL02220128.9.

100381 According to the present invention, it is prefenble that the eciprocaiing am include a saw bode capable of scrolling and pendular movement as described in China Application No. 200420024S32.0 which is hereby incorporated by reference. l

-a _ A. . t0039] When in practice use, a user can grasp the knob 8 with one hand and held die motor housing 2 with dig other hand. Alternatively, the user car, also mount Me handle 1Q to the housing I and operate with one hand held on Me handle.

10040] While the invention has been described in the specification and illustrated in the drawings with refercrce to preferred embodiments, it will be under800d by Hose skilled in thug art that various changes Inay be Inadc and equivalents may be substituted for elements thereof without departing from the scope of the invendon as defined in die claims.

Accordingly, it is intended that the invention not be limited to the particular embodiment illustrated by the drawings and described in Me specifuon as He best mode presently contunpia - 4 for can ying out this invention, but that the invention will include any embodiments falling within the scope of the accompanying Claims. -let

Claims

What is claimed is: 1. A reciprocating saw, comprising a lowing housing, a gear system disposed within die leading housing, a motor housing having a motor disposed Herein; a first switch trigt;l disposed on the motor hocusing for activating a first switch within Me motor housing; and a scpaIate handle detachably mounted to the housing.
2. A reciprocating saw of claim 1, wherein the handle composes a pair of connectors, each connector comprising a Wing portion extending therebelov for slidable engagement with a paw of key bosses incorporated on the motor housing.
3. A reciprocating saw of claim 2, wherein the handle includes a second switch Signet.
4. A reciprocadag saw of claim 3, wherein the handle further comprises a lever which operably interconnects the first switch trigger and the second switch trigger.
5. A reciprocating saw of claim 3, wherein the motor housing further contains a second switch, and the handle further comprises a lever, the lever being oberably connected to the second switch trigger, and being provided for activating the second switch.
6. A reciprocadug saw of claim l, wherein the first switch trigger locks when the haulle is attached to the motor housing.
7. A reciprocating saw of claim 6, wherein sa a motor housing furler includes a flame, the frame comprising a hole provided for selectively receiving a IOCkiDg pole.
8. A reciprocating saw of claim 7, wherein the protruding portion of the connector is confused to engage the locking pole, tbe protruding portion being provided for pushing the Iocicing pole into the hole.
9. A reciprocating saw of claim l, further comprising a blade damping device, the clamping device provided for tool less fixation of a saw blade.
10. A reciprocating saw of claim I, further composing a sole plate having at least one dust charnel, the at least one dust channel having at roast one opening disposed proximate the saw blade.
11. A reciprocating saw of claim 8, farther comprising means for scrolling the saw blade.
12 A reciprocating saw of claim 8, farther conprising means for oscillating Me saw blade.
13. A reciprocating saw of claim 6, further comprising an illumination system.
14. A reciprocadng saw of claim 6, furdcr comprising a lash aliment devcc
15. A mciprocaling saw, comprising a leading housing; a gear system disposed within the leading housing; a motor housing having a motor disposed therein; a first switch mimer disposed on We motor housing for activating a first switch within Me motor housing; and, a separate handle detachably mounted to the housing, the handle comprising a second switch trigger provided for activating a second switch disposed within the motor housing, He bangle furtber comprising a lever, the lever operably connecting the first switch trigger to the second switch trigger
16. reciprocating saw of claim 15, wherein the handle comprises a pair of connectors, each connector composing a protruding portion extending erebelour for slidable engagement with a pour of key bosses incorporated on the motor housing
17. A reciprocating saw of clean 15, wherein die first switch trigger locks when the handle is attached to the motor housing.
18 A reciprocating saw of claim 15, wherein said motor housing further includes a frame, the flame comprising a hole provided for selectively receiving a locking pole.
19. A reciprocating saw of claun ldi, wherein the protruding potion of Me connector is configured to engage the locking pole, the promenading portion being provided for pushing the locking pole into the hole.
20. A reciprocating saw, comprising a housing, the housing comprising a leading housing and a motor housing, a gear system being disposed within Me leading housing and a motor being disposed in the motor housing; a laser alignment device connected to die housing: a first switch Digger disposed on the motor housing; for activating a first switch within He motor housing; and, a separate handle detachably mounted to the housin thc handle compisug a second switch bigger provided for activating a second switch disposed within the motor housing, the handle furtherconpasing a Icver, the lever operably connecting the first switch digger to the second switch trigger.
21. A reciprocating sew of claim 20, wherein the Isser alignment device is integrally fanned into Me housing.
22. A reciprocating saw, comprising: a housing, the housing comprising a leadtog housing and a motor housing, a gear system being disposed within the leading housing and a mount being disposed in the motor housing:.

a first switch trigger disposed on the motor housing for activating a fiat switch within We motor housing a Separate handle detachably mounted to the housing, the handle comprising a second switch trigger provided for activating a second switch disposed within the motor housing, the handle further eonpasing a lever, the lever operably connecting Me first switch trigger to the second switch trigger; and, a blade clamping device, the clamping device composing: a fixing element' the fixing element composes a cavity provided to receive a saw blade; a sleeve disposed in slidable engagement with die fixing element; a pair of rollers disposed on in parallel wig Me other within the facing element; and, at least one spring, wherein one cad of the at least one span" abuts at least a portion of the sleeve and an opposed end of the spring abuts at least a portion of the fixing element.