JPH03503382A - jigsaw - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] jigsaw The invention is a jigsaw, and more specifically, a jigsaw that can be used without the use of tools external to the structure of the jigsaw itself. This article relates to a jigsaw with a blade holding device that allows the saw blade to be replaced.

In known jigsaw structures, the blade is e.g. Ir, S, -A-3665985. It is secured by a fixing screw that engages the lateral surface of the blade and securely tightens it in place. or as shown in G, B, -A-1173172 (where the blade is bayonet The bayonet lug is formed into the driveshaft end piece cage when in use. bayonet (retained in the corresponding retaining groove with a screw that engages the end of the blade) It is fixed to the reciprocating drive shaft by a mechanism that combines a bolt and a fixing screw.

Both of these mechanisms require the use of an external tool (screwdriver) to change the blade. It has the disadvantage of being This is an inconvenience for people who are either idiots or inexperienced. Rorui is a mysterious Sakutosha who is a blade fighter! After about 4 steps, fix the retaining screw t - the pot that is damaged. There is a risk that the blade may unintentionally come off the drive shaft during use as a result of insufficient tightening of the screw. It's dangerous.

Bayonet fit for receiving blades with bayonet lugs according to the invention bayonet fitting in the 4th part of the jigsaw, and when using the jigsaw drive having a diagonal locking means that engages the blade to retain the lug in the retaining groove of the blade; A jigsaw with a moving shaft, wherein the locking means is such that the bayonet lug is located in the retaining groove. It is movable to a disengaged position where it can be disengaged and allow removal of the blade and insertion of a new blade. In some types, the locking means do not require the use of a separate tool from the jigsaw itself. The special ridge is that it can be moved to the dissociation position.

Therefore, conventional technology requires a screwdriver to remove one or more time-keeping screws. disadvantages are avoided.

Advantageously, the locking means is integrated into the jigsaw and permanently connected to the locking means. The dissection device can be moved to the dissection position by the dissection device. With this configuration, S Damage to the locking means caused by partial or incorrect engagement of the release device is Avoided. Furthermore, the dissociation device is preferably manually operated to operate the dissociation device. The release member includes a release member that can be removed during normal reciprocating motion of the drive shaft. It is configured so that it does not move.

In the 5A example which is superior to the present invention, the locking means are G and B. -A-1173172 An axially movable screw on the drive shaft in a manner similar to the prior art arrangement shown. child In the case of , the screw rotating member is permanently attached in a manner that prevents relative rotation between the screw and the screw rotating member. is engaged with the screw. In this case, there is a dissociation that can be grasped by hand. The member is rotated by a screwdriver in order to fully rotate the screw rotating member and rotate the screw at the same time. Introduced to the transfer member. Advantageously, the torque limiting device is a hand-gripable solution. It is placed between the releasing member and the screw rotating member, and moves the screw toward the blade. limits the torque that can be applied to the screw in the direction of Using this method, tighten the screws. Damage caused by scratches is avoided. advantageously The torque limiter is a 7-handed grip solution that moves the screw away from the blade. There is no limit to the torque that can be applied by the release member.

In another embodiment of the invention, the cocking means comprises a spring to hold the bayonet lug in the retaining groove. This spring preloads the blade in the direction of the exterior of the drive shaft to hold it in place. Advantageously, Ro The locking member is disposed between the spring and the blade, and the disengaging device is connected to the locking member 2 and 2. The tensioner has nine metal parts connected to a manually operable tensioner. The member is moved to compress the spring and allow removal of the blade.

Extreme operations, e.g. when the gigno is used with the bottom of the blade striking a hard surface. The condition is that the locking means has a direction towards the inside of the drive shaft against the preload of the spring. An advantageous embodiment of the invention is obtained by allowing limited movement of the blade. It will be done. This configuration reduces the load on the drive shaft and the rest of the gigno mechanism. The resulting OR attack is significantly reduced.

Advantageously, the locking member can be released! Locking member except when raised into position It is advantageous if this prevents rotation of the blade relative to the drive shaft.

The present invention will be better understood from the following description of two configurations, which are merely illustrative. Let's go. Regarding attached page 9: Figure 1 shows the first embodiment of the present invention in a partially cutaway manner. Figure 1A is a perspective view showing a tensioning member suitable for use in the embodiment 1. The second cause is a partially enlarged view of the embodiment shown in Fig. 1. Figure 3 shows a modification of the embodiment shown in Figure 1, and Figure 4 shows another modification of the embodiment shown in Figure 1. FIG. 5 is a partially cutaway view of the second embodiment of the present invention, and FIG. 6 is a diagram showing the shape. The figure is a developed view of the constituent members of the embodiment shown in Fig. 5, and Fig. 7 is a developed view of a modified version of the embodiment shown in Fig. 5. Open drawing, FIG. 8 is a partial cross-section of the modified version shown in FIG. 7 in its normal use configuration. This is the cause shown.

Referring first to FIGS. 1 and 2, a jigsaw 1 comprising a main body 2 and a drive @3 is shown. The drive shaft is shown partially cut away and the drive shaft is axially reciprocated in its normal form during use. They are connected via fitting 6t.

The bayonet fitting consists of the end fitting 7, which is the main part of the drive shaft 3. a pair of diametrically opposed inlet slots 8 and a pair of mutually opposite inlet slots 8; The retaining groove 9 is completely formed with a diametrically opposed retaining groove 9. The configuration of the four-part cap 7 is G, B, -A. It is almost the same as that described in -1173172.

In the normal arrangement of the jigsaw, the blades 4 are provided with diametrically opposed A bayonet lug 10 is arranged in the retaining groove 9. In this case, Figure 1, As shown in Figure 2, the upward movement of the drive shaft is transmitted to the blade, causing the blade to perform upward cutting. Let them do the process.

With particular reference to FIG. The parts up to 11 are accommodated in the locked slot 12. ! :1st part is As seen in the second factor, the blade is preloaded downward by the compression spring 14, and The upper end 11 of the blade is engaged to exert a spring force on the blade. Therefore, as seen in Figure 2, The blade is preloaded downward by spring 14 so that the This is sufficient to retain the lug 10 within the retaining groove 9 during normal operation.

However, there is no extreme case where a large upward axial impact force is brought to the blade 4. If a rolling condition is encountered, the blade will move against the preload of spring 14 as shown in FIG. It can only move to a limited extent above the 9th position. With the upward movement, the blade 4 Lift the locking member 13 and lower it to compress the spring 14. Axial direction of rise As soon as the force is removed from the blade, the spring 14 locks the locking member 13 as shown in FIG. back into position, thus returning the lug 10 to the groove 9. Under such circumstances The upward axial movement of the blade is achieved by engagement between the upper surface 15 of the lug 10 and the shoulder 16 provided on the drive shaft. &C.

The locking member 13 includes a pair of outwardly extending lugs 11, which are used during normal operation. Under the conditions, the inlet slot is closed to prevent rotation of the locking member 13 within the drive shaft It is located within point 8. The axial overlap between the lug 17 and the inlet slot 8 is The distance between the top surface 15 of the lug 10 and the shoulder 16 is also larger than the normal distance, which causes the top surface Even when the lug 15 and the shoulder 16 are engaged, the lug 17 is still a one-part loss slot. It is in the B. Therefore limited axial movement of the blade 4 under extreme operating conditions is allowed, but the rotational movement of the blade 4 relative to the drive shaft causes a lug to the inlet slot 8. In order to disengage the blocking blade 4 through ITO engagement, a tensioning member 18, including a locking member, is used. By exerting tension on the wire or bowden cable connected to the block member 13 is lifted from the position shown in FIG. 2 to the position shown in FIG. Lock member 13t-? i! The raising barb 14 is compressed, and the barb 4 is pressed by the spring. Freed from reload. Kotoku member 13 releases lug 17 from entry slot 8 When the blade is raised sufficiently, grasp the blade 4 by hand and rotate it through 90° so that the locking member 13t - the bayonet lug 10 is aligned with the inlet slot 8 It can be rotated to the desired position. Next, remove the blade by hand and insert a new blade. You can enter. After the new blade is inserted, rotate the blade by hand through 90°. , and hold the bayonet lug 10 of the new blade without tension from the tension member 18. Preload spring 141 is reapplied to the blade to hold it in groove 9.

Tension can be applied to tension member IB using any suitable means. Figure 1 In the case of the embodiment, the upper end of the tension member 18 is fixed to the cam nut 19. The cam nut is fixed to the upper end of the drive shaft 3 and moves on the threaded spindle 20. mosquito The nut 19 has a pair of diametrically opposed ribs 21t, and the ribs are The rotary member 23 moves within a slot 22 formed in the rotary member 23.

In FIG. 1, the central portion of member 23 shows cam nut 19 and threaded spindle 20. However, the cam nut is usually not completely contained within the member 23. It will be recognized.

The member 23 is located within the body of the jigsaw and is fixed against movement. During normal use of the saw, the reciprocating movement of the drive shaft causes the cam nut 19 to reciprocate within the member 23. If it is desired to apply tension to the material 18, a nut rotating member 23 is a suitable means. The cam nut is rotated by the corresponding rotating part of the cam nut. This is the next t- to raise it on the threaded spindle 20 to create tension in the member 18. Give in a different way. This configuration prevents the upward movement of the cam nut relative to the drive shaft. It is noted that this can be obtained independently of the position of the drive shaft within its driving cycle. It will be.

Member 23 may be pivotally attached to the body by any suitable means, such as 25t, which are connected to the member 23 through mutually meshing bevel gears 25t, and which are manually operable. It can be rotated by lever 24.

FIG. 1A shows one possible configuration for securing tension member 18 to cam nut 19. It is shown. In this configuration, the tension member 18 is in the shape of a wire, and the end of the wire The section 18A is bent and fixed in place, at the upper end of this tension member. A head 40 is formed.

Tension member 18 extends through a pair of slots on plate 41,42. Ru. When in use, these plates fit into the recessed portion 4 formed on the top surface of the cam nut 19. It is located within 3. The slots in these plates are closely connected to the tension member 18t. receiving and facing each other at 90° f: so that the heads 40 are It is not possible to pass through the created passage.

In the modification of FIG. 1 shown in FIG. 3, a cam surface 26 is provided at the upper end of the drive shaft. and when the member 23 is rotated, the lower edge 2 of the sword 21A is rotated. 7 moves on the cam surface 26 and drives the cam nut 19A relative to ``!J!J@ Desired axial inner reach 1E! 7′! ii'' occurs.

In the variant shown in No. 4G, the cam nut 19, the threaded spindle 20 and the rotating Member 23 is similar in construction to that of FIG. However, member 2312) rotation is sliding The slide member is provided with a rack 45, the rack being It meshes with the 15=on teeth 46 formed on the member 23. Therefore slide The sliding movement of member 44 in the direction indicated by arrow 47 causes member 23″f: rotation. to rotate the cam nut and apply tension to member 1B as described above.

Reference is now made to FIGS. 59 and 6, which illustrate alternative embodiments of the present invention. Ru. In this embodiment the drive shaft 3 has an end cap substantially identical to that shown in FIG. 74-m, a bayonet fitting 6 is provided to receive a suitable blade. ing. Bayonet fitting device also G, B, -A-117!1172 Km is similar to that shown in t. However, in this case, the blade / jonel trag is It is usually held in the retaining groove of the end cap 7 by a screw 28, and the screw 2B is engaged with I of the hollow drive shaft 3. The screw 28 applies a downward force to the blade. The upper edge of the blade to secure the bayonet lug of the blade within the retention groove of the end cap. It is arranged so that it may engage with part 11.

The screw 28 has four extensions 29 with a D-shaped cross section tf. The extension part 29 is the drive shaft In all operating positions of 3, f is a screw rotating member 3 having a D-shaped cross section. It overlaps with 0 in the axial direction. Therefore, in the range of axial overrough 7'31. The extension 29 and the drive shaft 3 have opposing flat surfaces that slide against each other.

A threaded rotation member 30 extends upwardly within the drive shaft and within a suitable rotation mechanism 32. It's over. During normal use of the saw, this mechanism 32 jig-saws the screw rotating member 30. 2B in a fixed position relative to the casing of the drive shaft and the shaft of the screw 2B. The reciprocating motion in the direction is the extension 29 in the zone of axial overlap 31 and the screw rotation. adapted by axial sliding movement between mutually facing surfaces of members 30 . To release the held blade, screw 28t - If you want to remove it, screw rotating member 3 0 is rotated by the rotating machine s32, and this rotation is caused by the rotation of the overlap 31. The rotation of the screw is transmitted within the zone to the screw extension 29. insert new blade After soldering, member 30 is rotated in the opposite direction and screw 28 is tightened.

Advantageously, the rotation 'Ia mechanism 32 is moved downwardly by the screw 28t as shown in FIG. means for limiting the torque that can be applied to the member 30 in the direction of This prevents over-tightening of the screws.

A tightening directional torque limiting mechanism 32 is shown in FIG. Screw rotating part The upper end of the material 30 is fixed to a ratchet member 33, and the ratchet member has a pawl when in use. It is driven via the shutter 34. The pawl plate is a slot on the outer periphery of the ratchet member 33. It has an integral finger 35 that fits into the cut 36. Tsume Deshu 34 is overdrawn. can be slid over the teeth formed between the slots 36 of the Advantageously, fi The profile of the teeth of the screw and ratchet are aligned with the direction of tightening the screw 28. If the bar torque is limited to a favorable value, e.g. I Nrn, but the snap in the opposite direction pull-over is selected to be substantially prevented, thereby allowing high levels of torque E screws can be given through the nail desh to remove the second screw.

The claw desh 34 can be driven by any suitable means, for example, the drive lever 371C. The drive lever is permanently fixed to the jigsaw housing and has a claw. It includes a tubular tube 38 surrounding the bushing 34. tubular The inside of the body 38 has a pair of /de 39 (one is not visible in the drawing), and the lizzo has a claw. The receiver is received in the slot 48 which is larger than the dimensions of the receiver. A rotating nine-way connection is formed between the bar 3γ and the pawl bush 34.

During normal use of the jigsaw, the jig is used to hold the lever in the rest position shown in Figure 5. saw 2fi: f1f - the tubular body is A fin 49 has a ridge 50 on its outer surface. At this i position, lever 3T The outer surface of the jigun is flush with the adjacent surface of the main body. But grab the lever and arrow 53, pull the raised portion 50t-snap onto the cooperating means of the body. can be turned on and the lever brought into use position. In this usage position The bar is rotated to rotate the pawl plate 34 and the ratchet member 33t, as described above. The nail can then be dissociated. After inserting the new blade, screw 28 onto lever 37. The rotation causes the pawl tissue 34 to begin to snap over onto the ratchet teeth. It can be tightened up to. Rotate the lever 3γ until the lever is almost aligned with the main body. , and the passive obtained at this time between the reso 39 and the slot 48 is the lever. - is pushed downward to cause the raised portion 50f to snap over onto the cooperating means on the main body. Before returning the lever to the rest position shown in Figure 5, adjust the lever relative to the main body. The longest (used to facilitate rows).

This configuration ensures that the torque limiting member 32 is not stressed when the lever is in the rest position. I guarantee that it will work.

Holds the pawl 34 in the correct operating position relative to the ratchet member 33 In order to do so, the head 51 and pawl groove 52vC on the ratchet member are used to A nap bond may be formed. Once the head 51 is pushed into the groove 52V3 Once the ratchet and pawl are held in the correct, relative axial position, however, These can be rotated relative to each other if required for torque limitations. Ru.

An alternative configuration for applying the desired torque to the screw rotating member 30 is shown. this place When the upper end of the screw rotating member 30 is fixed to the ratchet member 54, the ratchet In use, the toe member is driven through the pawl disc 55'if.

As described with reference to FIG. The fins cooperate with the slots 36 on the outer periphery in the ratchet member 54, This allows the pawl and ratchet mechanism to apply only a limited amount of torque to the screw 28. The force can be transmitted to the screw rotating member 30 in the opposite direction, but the force can be transmitted to the screw rotating member 30 in the opposite direction. does not limit the torque that can be applied.

As shown in FIG. 8, the ratchet member 54 and pawl dew 55 are normally It is housed in a chamber 56 that is open at the bottom and is formed inside a knob 57 that can be grasped by hand. It is tolerated. The lower portion of chamber 56 is formed by a plurality of spring fingers 58. The spring fins each have an outwardly directed turn 59 at their lower end. Figure 8 In the normal use arrangement shown in Figure 2, teeth 59 are provided on the body of the jigsaw. It engages the underside of the inward facing 7 runzo 60, thereby holding the knob to the body of the jigsaw. n is freely rotatable relative to the main body. Below the ratchet member 54 Tighten it into the finger 58 at the position of the furanzoro 1μ tooth 59 of the outer end of rtfJ@. ), which prevents the fingers 58 from moving inward in the radial direction. The knob is thus held tethered to the body of the gun. Ratchet member 5 4 is preloaded upwardly by a spring 62 into the position shown.

The operating member 63 is configured to prevent relative rotation between the operating member and the knob. 57. To accomplish this, the illustrated embodiment includes an operating section. The material has a head 64 disposed within the knob recess 65 and a pair of outwardly directed Kino rug 66'! ! - Prepared. The lugs 66 are slots 67 formed in the knob. This prevents relative rotation of the operating member with respect to the knob. . The operating member 63 also has a shaft 68, the details of which extend downward from the head 64 into a recess 65. It passes through the bottom and extends into the chamber. The lower end of the shaft 68 is provided on the claw gusset 55. It has a spline 69 for cooperating with the spline 70 that is aligned.

In the normal use arrangement shown in FIG. The position of the spline 70 is also vertically lowered, so that the drive member is placed between the two splines. There is no case. Therefore, the rotation of the knob 57 relative to the main body is If you want to rotate the screw rotating member 30 by rotating the corresponding unit 55 of the operating member 63, In this case, lug 66 is grabbed and operating member 63 is indicated by arrow 711C. The spline 69 and the spline 10 are brought into engagement with each other. operation The amount of movement allowed for the member is greater than the amount required to remove lug 66 from slot 67. small, so engaging the splines 69 and 70 together will allow the knob 57 to Rotate it with the claw and insert the claw desh 55 through the operating member 63 and the engaged spline. can be rotated.

It is tightened again by rotation in the opposite direction. The pawl desh 55 and ratchet member 54 are added. Limit the torque that can be tightened as described above.

If you want to remove the knob 5 foot for some reason, the operating member 63 is pressed (as indicated by the arrow). 71) and latch against the preload of the spring 62. The jet member 54 and the screw rotating member 30 are pressed. The hula moves inward when viewed in the radial direction. can be removed, thus allowing tooth 59 to disengage from seven langes 60. Long time nobu 57 can be pulled out from the jigsaw together with the operating member 63 and the claw plate 55.

The knob assembly can be reinstalled by simply pushing it into place. As a result, the lower end of the finger 58 engages with the upper surface of the Franzoro 1 and ratchets. 1159 can pass through the opening r formed by the 7-ring 60 through the opening 54. In this case, the fingers 58 are returned to the outside and the teeth 59 are pressed against the flange. 8 and the ratchet member 54 reoccupies the position shown in FIG. allow it to happen.

Except for the screw rotation member 30 and the spring 62, the rotation mechanism as described above, and especially the claw portion The various components of the rod and the ratchet element are preferably injection molded from plastic material. Produced by.

Threaded extension 29 and threaded rotation member 30 are illustrated above as having a D-shaped cross section. Although these components provide relative axial cleaning motion, It is recognized that they may have any complementary cross-sections that prevent relative rotation to each other. Let's go. Furthermore, the mutually facing sliding surfaces of the extension 29 and the screw rotating member 30 are advantageous. It is recognized that the material is treated to impart wear resistance, for example by carbonitriding. Good morning.

international search report international search report EP 81!00201 5 people 21338

Claims (10)

[Claims] 1. Bayonet at the end to receive the blade (4) with bayonet lug (10) Bayonet fitting (6) and holding the bayonet fitting while using a jigsaw Locking means (13) for engaging the blade to retain the blade leg within the slot (9). , 14 or 28), the jigsaw has a drive shaft (3) with a lock Means (13, 14 or 28) prevents the bayonet lug from exiting the retaining groove and causing the blade to Some types are movable to a disengaged position to allow removal and insertion of a new blade. In this case, the locking means (13, 14 or 28) is attached to a tool separate from the jigsaw. A jigsaw characterized in that it can be moved to a dissociation position without using it. 2. Locking means (13, 14 or 28) are incorporated into the jigsaw and only The release device (18 to 28) is also permanently coupled to the locking means (13, 14 or 28) 24 or 29 to 37) to the dissociation position, and the dissociation device is connected to the drive shaft. (3) A hand-gripable release member (24) that does not move during normal reciprocating motion. or 37). The jigsaw according to claim 1, comprising: or 37). 3. The locking means are movable in the axial direction of the drive shaft so as to engage the end (11) of the blade. The dissociation device is a screw (28) extending axially within the drive shaft (30). a member (30) allowing relative sliding movement between the screw and the screw rotating member; However, it is of a type that prevents relative rotation between the screw (28) and the screw rotating member (30). A jigsaw according to claim 2, wherein the screw rotating member is permanently engaged with the screw. . 4. The torque that can be applied to the screw in the direction of moving the screw toward the blade. A releasing member (3) which can be grasped by hand via a limiting torque limiting member (32) 7) A jigsaw according to claim 3, wherein the screw rotation member (30) is connected to the screw rotation member (30). 5. The locking means (13, 14) are provided with a spring (14), which spring is located within the retaining groove (9). Insert the blade (4) toward the outside of the drive shaft (3) so as to hold the bayonet lug (10) at the ) and the release device releases the blade from the spring preload. Claim 1 or 2, comprising means (18-24) for compressing the spring (14). Jigsaw described in 2. 6. A locking member (13) is arranged between the spring (14) and the blade (4), and The disengagement device consists of a tensioning member (18) which is connected to the locking member (13) and and pull the tension member (18) to move the lock member (13), thus and coupled to a manually operable tensioning device (19-24) for compressing the spring (14). 6. The sign-out according to claim 5, wherein: 7. The locking member (13) will prevent the pre-rotation of the spring (14) under extreme interlocking conditions. allow limited movement of the blade (4) inward of the drive shaft against the The blade (4) relative to the drive shaft (3), except when the blade is moved to the disengagement position. 7. The jigsaw according to claim 5, wherein the jigsaw is adapted to prevent relative rotation of the jigsaw. 8. The locking member (13) has a lug (17), and the lug locks the locking part during use of the jigsaw. The bayonet fitting is designed to prevent relative rotation between the material (13) and the drive shaft (3). any one of claims 5 to 7, engaging the inlet slot (8) of the ring (6); or the jigsaw described in item 1. 9. The tensioning device (17-24) is connected to the cam nut (19) connected to the tensioning member (18). ); the cam surface (20) is connected to the drive shaft (3) in order to cooperate with the cam nut. fixed; and the nut rotating member (23) is connected to the nut rotating member (23) and the cam. Allowing relative axial sliding movement of the nut (19) but not the nut rotating member (23) and the cam nut (19) in a manner that prevents relative rotational movement between the cam nut (19) and the cam nut (19). A jigsaw according to any one of claims 6 to 8. 10. A manually grippable release member (37) connects this to the screw rotating member (3). limiting the release member (37) without causing a corresponding rotation of the screw rotating member. They are connected via pneumatic couplings (39, 48) that allow rotation, and this limited rotation The rotation is adapted to the number of teeth on the pawl bushing (34), but preferably at an angle of more than 60°. 5. A jigsaw according to claim 3, wherein the angle is approximately 90°.