Reciprocating saw

Abstract

The present invention discloses a reciprocating saw, comprising: a housing, forming a storage space; a motor, providing power for the reciprocating saw, and arranged in the storage space; a slide bar, comprising a first end and a second end, the first end being connected to a saw blade; a transmission assembly, connecting the motor and the slide bar, and driving the slide bar to reciprocate; a balance block, connected to the transmission assembly; a guide device, comprising a first surface, the second end of the slide bar moves on the first surface of the guide device, and the balance block and the second end of the slide bar are located on the same side of the guide device. The present invention realizes a knife lifting function while ensuring that the internal space of the reciprocating saw is not enlarged, thereby improving the cutting efficiency of the reciprocating saw.

Description

Technical Field

[0001] The invention relates to an electric tool, in particular to a reciprocating saw. Background Art

[0002] Reciprocating saws use a transmission assembly to drive the saw blade to do reciprocating motion to achieve cutting operations. Some reciprocating saws have a special blade lifting structure set inside them, so that the movement trajectory of the saw blade is roughly elliptical, thereby achieving the effect of increasing cutting efficiency. Some reciprocating saws are more compact in appearance and the internal space is more strictly limited, so that their cutting efficiency cannot be further improved. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the purpose of the present invention is to achieve a blade lifting function to improve the cutting efficiency while ensuring that the volume of the reciprocating saw is not increased.

[0004] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solution: a reciprocating saw is proposed, comprising: a casing, forming an accommodating space; a motor, providing power for the reciprocating saw, and arranged in the accommodating space; a sliding rod, comprising a first end and a second end, the first end being connected to the saw blade; a transmission assembly, connecting the motor and the sliding rod, and driving the sliding rod to reciprocate; a balancing block, connected to the transmission assembly; a guide device, comprising a first surface, the second end of the sliding rod moves on the first surface of the guide device, and the balancing block and the second end of the sliding rod are located on the same side of the guide device.

[0005] Optionally, the second end of the slide rod is located between the balancing weight and the guide device.

[0006] Optionally, the transmission assembly includes a first eccentric structure and a second eccentric structure, the first eccentric structure drives the balancing block to reciprocate, and the second eccentric structure drives the sliding rod to reciprocate.

[0007] Optionally, the slide bar comprises a support portion, wherein the support portion is supported by a slide bar bearing.

[0008] Optionally, the slide rod bearing comprises a pin, and the slide rod swings around the pin.

[0009] Optionally, the slide bar bearing is a ball bearing, which allows the slide bar to swing.

[0010] Optionally, the slide bar bearing is an elastic bearing, and the elastic end of the elastic bearing enables the slide bar to swing.

[0011] Optionally, when the second end of the sliding rod moves on the first surface of the guide device, it passes through a first position and a second position of the first surface, and a height difference between the first position and the second position is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0012] Optionally, the reciprocating saw further comprises a lower gear box cover, the lower gear box cover is located between the slide bar and the housing, and the guide device is fixed on the lower gear box cover.

[0013] Optionally, the guide device includes a left guide device and a right guide device.

[0014] The benefit of the present invention lies in that a first surface capable of realizing a blade lifting function is provided on the guide device of the reciprocating saw, so that the cutting efficiency of the reciprocating saw is improved without sacrificing the volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the appearance of a reciprocating saw;

[0016] Figure 2 is an internal perspective view of a reciprocating saw as a first embodiment with a portion of the housing removed;

[0017] Figure 3 yes Figure 2 An exploded view of a portion of the reciprocating saw in FIG.

[0018] Figure 4 yes Figure 3 Schematic diagram from another perspective;

[0019] Figure 5 It is a schematic diagram of the transmission components combined;

[0020] Figure 6 yes Figure 3 A schematic diagram of a guide device in a certain perspective;

[0021] Figure 7 is a schematic diagram of the slide bar sliding on the guide device fixed on the lower gear box cover;

[0022] Figure 8 is a schematic diagram of a slide rod bearing including a pin;

[0023] Figures 9 to 11 are side cross-sectional views of three embodiments of the guide device;

[0024] Fig.12 yes Fig. 9 A partial enlarged view of a side sectional view of the guide device shown;

[0025] Fig.13 is a top view of the slide bar when it moves to the first position on the guide device;

[0026] Fig.14 yes Fig.13 A side cross-sectional view of

[0027] Fig.15is a top view of the slide bar when it moves to the second position on the guide device;

[0028] Fig.16 yes Fig.15 A side cross-sectional view of

[0029] Fig.17 yes Figure 2 A side cutaway view of a reciprocating saw is shown;

[0030] Fig.18 It is a schematic diagram when the guide device is a left guide device and a right guide device. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In order to clearly illustrate the technical solution of the present invention, Figure 1 Six directions are defined: up, down, left, right, front, and back. Figure 1 to Figure 2 As shown, the present invention provides a reciprocating saw 300, including a housing 400, a motor 410, a transmission assembly 430, a balance block 440, a slide bar 450 and a guide device 470. The housing 400 forms a certain accommodation space 401. When the motor 410 is working, the power outputted by the motor 410 drives the saw blade 490 to reciprocate on the cutting plane 10.

[0033] Figure 3 and Figure 4 Exploded views of the partial structure of the reciprocating saw 300 of the first embodiment under two viewing angles. In this embodiment, when the motor 410 rotates, the motor output shaft drives the large gear 431 on the transmission assembly 430 to rotate, thereby driving the eccentric structure connected to the large gear 431 to rotate eccentrically. The transmission assembly 430 includes a first eccentric structure 432 and a second eccentric structure 433. The first eccentric structure 432 drives the balance block 440 to reciprocate, and the second eccentric structure 433 drives the slide bar 450 to reciprocate. The two ends of the slide bar 450 are respectively a first end 451 and a second end 452, wherein the first end 451 is connected to the saw blade 490, and the second end 452 is connected to the second eccentric structure 433 of the transmission assembly 430. The second end 452 of the slide bar 450 includes a first driving surface 4521 and a second driving surface 4522. When the second eccentric structure 433 rotates eccentrically, a driving force is applied to the first driving surface 4521 or the second driving surface 4522, thereby driving the entire slide bar 450 and the saw blade 490 to reciprocate.

[0034] At the same time, the first eccentric structure 432 of the transmission assembly 430 is embedded in the first slot 441 of the balancing block 440. The first eccentric structure 432 and the second eccentric structure 433 are located in substantially opposite directions relative to the central axis (i.e., the first axis 4301) of the large gear 431, so that the movement directions of the balancing block 440 driven by the first eccentric structure 432 and the second end 452 of the slide bar 450 driven by the second eccentric structure 433 always remain substantially opposite. Specifically, in the cutting stroke of the reciprocating saw 300, the saw blade 490 is retracted backwards and the balancing block 440 moves in the forward direction; in the return stroke of the reciprocating saw 300, i.e., the blade lifting stroke, the saw blade 490 extends forwards and the balancing block 440 moves in the backward direction. It should be noted that the "front" and "rear" here are only approximate directions and do not refer to exact directions.

[0035] like Fig.17 As shown, the second end 452 of the slide bar 450 is located between the balancing weight 440 and the guide device 470. The balancing weight 440 can be connected to the slide bar 450 and the transmission assembly 430 through other structures, not limited to the eccentric structure.

[0036] Now focus on Figure 6 The reciprocating saw of the present invention includes a guide device 470, which includes a first surface 471 and a second surface 472. The second end 452 of the slide bar 450 moves on the first surface 471 of the guide device 470, and the balance block 440 and the second end 452 of the slide bar 450 are located on the same side of the guide device 470.

[0037] by Figure 6 , Fig. 9 and Fig.12 Taking the disclosed embodiment as an example, the first surface 471 of the guide device 470 includes three planes: a first slope plane 4711a, a second slope plane 4712a, and a third slope plane 4713a. The first slope plane 4711a includes a first position 4701a, the second slope plane 4712a includes a second position 4702a, and the slope of the third slope plane 4712a is the same as that of the first slope plane 4711a.

[0038] In this embodiment, the second end 452 of the slide bar 450 is located between the balance block 440 and the guide device 470. In addition, the slide bar 450 further includes a support portion 453, and the support portion 453 is supported by a slide bar bearing 460, and the slide bar bearing 460 ensures that the slide bar 450 can swing around the slide bar bearing 460. Optionally, the slide bar bearing 460 is a ball bearing 460a, so that the slide bar 460 can swing around the ball bearing 460a. When the second end 452 of the slide bar 450 swings in the up-down direction around the slide bar bearing, the balance block 440 also limits the swing of the second end 452 of the slide bar 450 in the up-down direction.

[0039] More specifically, combined with Fig. 9 , Figures 12 to 16 When the reciprocating saw 300 is in the cutting stroke, the saw blade 490 moves backward and cuts the workpiece. At this time, the second end 452 of the slide bar 450 moves from the first slope plane 4711a to the third slope plane 4713a, and the second end 452 of the slide bar 450 is raised from the first position 4701a to the second position 4702a. After passing through the slide bar bearing 460, the first end 451 of the slide bar 450 drives the saw blade 490 to press downward. Similarly, when the reciprocating saw 300 is in the return stroke, the saw blade 490 extends forward, and when the second end 452 of the slide bar 450 moves from the third slope plane 4713a to the first slope plane 4711a, the second end 452 of the slide bar 450 is lowered from the second position 4702a to the first position 4701a, and the saw blade 490 is lifted upward. A gap is created between the raised saw blade 490 and the workpiece being cut, which is beneficial to the discharge of debris, and the saw teeth will not come into contact and rub against the cut material during the return stroke, thereby increasing the cutting efficiency and prolonging the life of the saw blade 490 .

[0040] When the second end 452 of the slide bar 450 moves on the first surface 471 of the guide device 470, it passes through the first position 4701a and the second position 4702a of the first surface 471, and the height difference between the first position 4701a and the second position 4702a is greater than or equal to 0.2 mm and less than or equal to 1 mm. Fig.12 As shown, the height difference between the first position 4701a and the second position 4702a is represented by H.

[0041] Optional, Fig.10 and Fig.11 Two other implementations of the guide device 470 are shown. 4701b and 4701c are respectively the first position 4701 in the two implementations, and 4702b and 4702c are respectively the second position 4702 in the two implementations. The specific principles are the same as above and will not be repeated here. Fig.11 In the embodiment, when the second end 452 of the slide bar 450 moves on the first surface 471 of the guide device 470, the second end 452 moves to the third position 4703c which is lower than the second position 4702c after passing the second position 4702c. It can be understood that the first surface 471 of the guide device 470 does not need to be a plane, but can also be a curved surface.

[0042] Optionally, the guide device 470 further includes a second surface 472. In this embodiment, the second surface 472 of the guide device 470 supports the movement of the balancing weight 440 (see Figure 6 , Figure 7 and Fig.10); In other embodiments, the supporting force for the movement of the balancing block 440 may not be provided by the guide device 470. The reciprocating movement of the balancing block 440 in a direction substantially opposite to the sliding rod 450 is helpful in helping to reduce the vibration of the machine and improving the user experience. The balancing block 440 in the reciprocating saw 300 designed by the present invention moves on the second surface 472 of the guide device 470, which not only achieves the effect of balancing and shock absorption, but also saves space in the up and down directions, further ensuring the compact size of the machine. Optionally, the second surface 472 of the guide device 470 may include a platform 4721, which allows a gap to exist between the balancing block 440 and the guide device 470, thereby improving the heat dissipation capacity of the component and extending the life of the workpiece.

[0043] Now back to Figure 3 and Figure 4 , this embodiment further comprises an upper gear box cover 420 and a lower gear box cover 480, the lower gear box cover 480 is located between the slide bar 450 and the housing 410, and the guide device 470 is fixed to the lower gear box cover 480. The slide bar bearing 460 and the guide device 470 are fixed to the lower gear box cover 480. In some embodiments, the slide bar bearing 460 and the guide device 470 can also be directly fixed to the housing 400. In this embodiment, the end of the second eccentric mechanism 433 falls on the bottom plate 473 of the guide device 470 (see Figure 6 ), and slightly rubs against the bottom plate 473 during the reciprocating stroke. Optionally, the guide device 470 includes a left guide device 470d and a right guide device 470e (see Fig.13 ). The second eccentric mechanism 433 may not be in direct contact with the bottom plate 473 of the guide device 470, which does not affect the realization of the tool eccentric function and the tool lifting function. In other words, the bottom plate 473 of the guide device 470 is not a necessary component and can be changed in form according to the structure of the lower gear box cover 480 or the housing 400. If the guide device 470 is split into a left guide device 470d and a right guide device 470e without changing other characteristics, it also falls within the protection scope of this patent.

[0044] In addition, in this embodiment, the bottom plate 473 of the guide device 470 is fixed to the lower gear box cover 480 by screws. Optionally, the guide device 470 can also be adhered to the lower gear box cover 480 or the housing 400 by liquid adhesive, and the fixing method is not limited.

[0045] exist Figure 8 In the embodiment of the present invention, the slide bar bearing 460 is an elastic bearing 460b, and the elastic end 461 of the elastic bearing 460b enables the slide bar 450 to swing in the elastic bearing 460b. Figure 8In the embodiment, the slide bar bearing 460 includes a pin 462, and the slide bar 450 can swing around the pin 462. The slide bar bearing 460 is a rigid bearing 460c, and the rigid bearing 460c has a pair of pins 462 perpendicular to the cutting plane 10. The pins 462 allow the second end 452 of the slide bar 450 to rotate around the central axis (i.e., the second axis 4621) of the pin 462 when being lifted by the guide device 470. It should be noted that the slide bar bearing 460 is not limited to the above forms, and other forms or their combined structures are acceptable.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A reciprocating saw comprising: A casing, forming a receiving space; A motor, providing power for the reciprocating saw, wherein the motor is arranged in the accommodation space; A slide bar, comprising a first end and a second end, wherein the first end of the slide bar is connected to the saw blade; A transmission assembly, connecting the motor and the slide bar, and driving the slide bar to reciprocate; A balancing block connected to the transmission assembly; The guide device comprises a first surface, the second end of the sliding rod moves on the first surface of the guide device, and the balancing block and the second end of the sliding rod are located on the same side of the guide device, and the second end of the sliding rod is located between the balancing block and the guide device; when the second end of the sliding rod moves on the first surface of the guide device, it passes through a first position and a second position of the first surface, and a height difference between the first position and the second position is greater than or equal to 0.2 mm and less than or equal to 1 mm; the movement directions of the balancing block and the sliding rod are always opposite, and the guide device also comprises a second surface, and the second surface supports the movement of the balancing block.

2. The reciprocating saw according to claim 1, wherein: The transmission assembly includes a first eccentric structure and a second eccentric structure, wherein the first eccentric structure drives the balancing block to reciprocate, and the second eccentric structure drives the sliding rod to reciprocate.

3. The reciprocating saw according to claim 2, wherein: The slide bar includes a support portion, and the support portion is supported by a slide bar bearing.

4. The reciprocating saw according to claim 3, wherein: The slide bar bearing comprises a pin, and the slide bar swings around the pin.

5. The reciprocating saw according to claim 4, characterized in that: The slide bar bearing is a ball bearing, which enables the slide bar to swing.

6. The reciprocating saw according to claim 3, wherein: The slide bar bearing is an elastic bearing, and the elastic end of the elastic bearing enables the slide bar to swing.

7. The reciprocating saw according to claim 1, wherein: The reciprocating saw further comprises a lower gear box cover, wherein the lower gear box cover is located between the slide bar and the housing, and the guide device is fixed on the lower gear box cover.

8. The reciprocating saw according to claim 1, wherein: The guide device comprises a left guide device and a right guide device.

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