CN102729215A - Electric hammer - Google Patents

Abstract

The invention provides an electric hammer, comprising: a casing supporting a nail driving device; a motor placed in the casing, a transmission mechanism driven by the motor, and an impact assembly; the impact assembly includes an impact wheel and supports the impact wheel The intermediate shaft of the impact wheel, the impact part of the impact wheel impacts on the struck shaft of the nail driving device, the intermediate shaft is rotatably supported on the first support and the second support, the first support and the second support Located on both sides of the impact assembly, the transmission mechanism includes a first transmission member and a second transmission member, the first transmission member is drivingly connected to the intermediate shaft, wherein the axis of the first transmission member and the second transmission member axes are parallel. The electric hammer of the present invention is compact in structure and small in size, especially the distance from the center of the hitting shaft to the two sides of the casing head is shorter, and it can be more functionally used for nails in a narrow space, such as corners. hitting work.

Description

electric hammer

technical field

The invention relates to an electric tool, in particular to an electric hammer capable of striking fasteners such as nails. the

Background technique

Electric hammers are a commonly used hand-held tool with a wide variety. According to the power source, electric hammers can be divided into two categories: pneumatic and electric. Among them, the pneumatic electric hammer must be equipped with a compressed air source, so its use is limited. The basic structure of the electric hammer can be summarized as follows: the motor placed in the gun body is connected with the nailing rod placed at the gun head through the rotation-linear transmission mechanism, so that the electrical energy can be converted into reciprocating mechanical energy under the control of the switch. the

US Patent No. US6431430 and PCT International Patent Application Publication No. WO2006/008546 both disclose an electric hammer with a slider crank mechanism as a rotation-linear motion transmission mechanism and a battery as a power source. The problem with this type of electric hammer is that the crank slider mechanism cannot achieve real hitting, and is essentially a "push" nail mechanism. Under the same motor power, the efficiency of pushing nails is much lower than that of driving nails. The second is that during each nail pushing process, the crank slider mechanism must push the nail pushing element to travel the same stroke. When the nail encounters a hard object and the resistance is too large, it is easy to cause the motor to stall and cause the motor to be damaged; The 3rd, motor is placed on the handle front or rear side, connects with transmission mechanism and takes up larger space, makes electric hammer volume larger, and is all not convenient enough to carry and operate. the

The Chinese patent application with the patent application number 200410088827.9 discloses an electric hammer that converts the motor rotation into the force of a compressed spring through a rack and pinion mechanism, and then releases the compressed spring by means of a release mechanism to generate an impact force. Although the electric hammer utilizes spring energy storage to realize instant hitting on the nail, it can only be clicked one by one, and cannot be hit continuously, and the hitting force generated only by the energy released by the spring is not efficient, resulting in the electric hammer being ineffective. It is suitable for frequent use as a conventional tool; in addition, its motor is located in the casing under the gun head, completely separated from the handle, and there is still the problem of not compact structure. the

Contents of the invention

Aiming at the above-mentioned shortcomings in the prior art, the present invention provides an electric hammer with a compact structure. the

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

An electric hammer, comprising: a casing supporting a nailing device; a motor placed in the casing, a transmission mechanism driven by the motor, and an impact assembly; the impact assembly includes an impact wheel and an intermediate shaft supporting the impact wheel , the impact part of the impact wheel impacts on the hammered shaft of the nail driving device, the intermediate shaft is rotatably supported on the first support and the second support, and the first support and the second support are respectively located at the The two sides of the impact assembly, the transmission mechanism includes a first transmission member and a second transmission member, the first transmission member is drivingly connected to the intermediate shaft, wherein the axis of the first transmission member is parallel to the axis of the second transmission member . the

Further, the left end surface of the second transmission member does not exceed the left end surface of the intermediate shaft. the

Further, an elastic member is supported between the impact wheel and the first supporting member. the

Further, the elastic member and the first supporting member are staggered along the axial direction of the intermediate shaft. the

Further, the first support member has a first end close to the impact wheel and a second end far away from the impact wheel, and one end of the elastic member is supported on the first end and the first end of the first support member. between the second ends. the

Further, there are one or several elastic members. the

By adopting the above-mentioned technical scheme, the electric hammer of the present invention can realize periodic and continuous striking on fasteners such as nails on the one hand, and on the other hand, the whole implement is compact in structure and small in size, especially the center-to-center distance of the striking shaft from the casing. The distance between the two sides of the head is shorter, which is more functionally capable of hitting nails in a narrow space, such as corners. the

Description of drawings

Fig. 1 is the schematic diagram of electric hammer of the present invention, and wherein, in order to clearly see its internal structure, half shell is removed;

Fig. 2 is a schematic diagram of a partial section along the A-A line in Fig. 1, showing an embodiment of the structure between the parts in the casing;

Fig. 3 is another embodiment of each part structure;

Fig. 4 is another embodiment of structure between each part;

Fig. 5 is a schematic diagram of a partial section along the line A-A in Fig. 1, showing another embodiment of the structure between the components in the casing. the

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings. the

As shown in Figure 1, it is a schematic diagram of the electric hammer 1 of the present invention. The electric hammer 1 includes a casing 3, the casing 3 is formed by combining two halves of the casing, and its main body forms a grip handle 31 in the longitudinal direction. A switch 6 for controlling the start and stop of the motor in the casing 3 is installed on the handle 31, a DC battery pack 5 is installed at the lower end of the casing 3, and a gun mouth part 4 is opened at the head 32 of the upper end of the casing 3. The gun mouth part 4 accommodates a nail driving device 7 for driving fasteners such as nails. the

In this embodiment, the battery pack 5 and the grip handle 31 are arranged substantially coaxially, the outer surfaces of the shell of the battery pack 5 and the casing 3 are adjacent to each other smoothly, and at least a part of the battery pack 5 is inserted. In the casing 3, the connection between the battery pack 5 and the casing 3 is made more stable; in other embodiments, the battery pack 5 of the electric hammer of the present invention can also be parallel or perpendicular to the longitudinal axis direction of the handle 31 Setting; also not limited to DC battery pack power supply, AC power supply can be used. the

After half of the casing 3 is disassembled, the structure of the internal components can be clearly seen. The motor 2 is installed in the casing 3, and the rotational motion of the motor 2 is transformed into an impact action on the nail driving device 7 through the transmission mechanism 10. , in conjunction with Fig. 2 to Fig. 4, transmission mechanism 10 comprises the gear transmission part that can vertically steer and is used for the impact assembly 8 of impact nailing device 7, and nail driving device 7 comprises a striking shaft 9 that can reciprocate linear motion, and impact assembly 8 includes the impact wheel 12 and the intermediate shaft supporting the impact wheel 12. In this embodiment, the intermediate shaft is set as the rotating shaft 11 rotatably supported in the casing head 32. In other embodiments, the intermediate shaft It can also be a fixed shaft, the rotating shaft 11 and the impact wheel 12 have the same rotating axis X, the rotating axis X is perpendicular to the output axis Y of the motor, and the rotating shaft 11 is supported in the casing head 32 by means of supports at both ends, And it is driven by the transmission output part of the transmission mechanism 10. In this embodiment, the rotating shaft 11 is fixedly connected with the transmission output part of the transmission mechanism 10. In other embodiments, the rotating shaft 11 and the transmission output part can also be made into a whole (not shown); the impact wheel 12 is roughly in the shape of a hollow disc, and is sleeved on the rotating shaft 11 through its hollow part, and the impact wheel 12 is provided with at least one, preferably, two symmetrically with respect to its axis of rotation. The impact part 121 protruding outward from the outer circumferential surface, during the rotation of the impact wheel 12 driven by the rotating shaft 11, the impact part 121 of the impact wheel 12 periodically and continuously impacts on the impacted part of the striking shaft 9, thereby striking The front end of the shaft 9 strikes periodically and continuously on fasteners such as nails, finally realizing that the nails are gradually knocked into the workpiece to be processed. the

At the fitting position of the rotating shaft 11 and the impact wheel 12, the outer cylindrical surface of the rotating shaft 11 and the inner cylindrical surface of the impact wheel 12 are respectively formed with a pair of inclined grooves 115 and guide grooves 125 inclined relative to the axial direction. 125 corresponds to the positions of each chute 115 respectively, and a pair of steel balls 14 are respectively located in the cavity formed by the connection of the corresponding chute 115 and the guide groove 125, and can follow the relative position of the chute 115 and the guide groove 125. The change of the position of the cavity caused by the change moves. Therefore, when the rotating shaft 11 rotates, the steel ball 14 located in the chute 115 can press the guide groove 125 to drive the impact wheel 12 to rotate. The energy storage spring 13 is installed in the casing 3 , with one end 132 in a fixed position, and the other end 131 abutting on one side of the impact wheel 12 . The energy storage spring 13 applies thrust to the impact wheel 12 along the axial direction of the impact wheel 12, so that the steel ball 14 is located at the top of the chute 115 and the bottom of the guide groove 125 when the rotating shaft 11 and the impact wheel 12 are stationary and rotating without load. At the end, the impact wheel 12 is in the first axial position relative to the rotation shaft 11; when the motor is started, the impact part 121 on which the impact wheel 12 rotates together with the rotation shaft 11 hits the impact shaft 9, and the impact is achieved. A shock of the shaft 9, at the same time, because that end of the hitting shaft 9 that is in contact with the impact wheel 12 will temporarily stop the further rotation of the impact wheel 12, the impact wheel 12 will be forced to be in the grooves 115, 125 and the steel ball 14 therein. Under the action, the axial displacement occurs relative to the rotating shaft 11 toward the second position of the compressed energy storage spring 13; when the impact wheel 12 moves to the contact of the staggered driving shaft 9 and breaks away from the locked-rotor situation, the energy storage spring will 13, under the action of releasing the elastic potential energy, it rotates at a speed exceeding the normal rotation speed of the rotating shaft 11, and is moved to the first position again, through its rotational potential energy, the impact wheel 12 is caused to have a powerful impact on the striking shaft 9, and the impact is high again. Hit axis 9. the

As shown in Figure 2, the beating shaft 9 of the nailing device 7 is approximately in the middle of the casing head 32, and the distances from both sides 321, 322 of the casing head 32 to the beating shaft 9 are substantially equal, and the impact The rotating shaft 11 of the assembly 8 is supported in the casing head 32 in a transverse direction perpendicular to the axis of the striking shaft. The two ends of the rotating shaft 11 correspond to the two sides 321 and 322 of the casing head 32 respectively. Therefore, The lateral dimension of the rotating shaft 11 directly determines the width between the two sides of the casing head 32, and the rotating shaft 11 is rotatably supported by the first and second support members. In this embodiment, the first and second support members are respectively Provided by the first bearing 15 and the second bearing 16, the first bearing 15 has a first end 151 close to the impact wheel 12 and a second end 152 away from the impact wheel 12, and one end of the energy storage spring 13 is supported on the second end. On the part 153 between the first end 151 and the second end 152 of a bearing 15, in this embodiment, the part 153 is configured as a step surface lower than the end face of the first end 151, in other embodiments, the part 153 It can also be configured in other forms, as long as it is lower than the first end 151 to form a concave structure into which the energy storage spring 13 can partially extend, that is, it falls within the scope of the present embodiment. the

3, the energy storage springs 13 can also be multiple, symmetrically distributed on the periphery of the rotation shaft 11 with respect to the axis of the rotation shaft 11, and the first end 151 of the first bearing 15 faces the hollow space surrounded by several energy storage springs 13. extend in the space, so that the first bearing 15 and the energy storage spring 13 are staggered in the axial direction of the rotating shaft 11, and there is an overlap in size, which makes the structure more compact. At the same time, the first end 151 of the first bearing 15 and the second end 151 The length between the ends 152 is sufficient to support the rotating shaft 11, so the support is more stable and not easy to wear. When the energy storage spring 13 was provided by a large spring, referring to Fig. 2, the first end 151 of the first bearing 15 stretched into the hollow formed by the large spring body, and the same, the energy storage spring 13 and the first bearing 15 In the direction along the axis of the rotating shaft 11 , there is a size overlap, and the structure is compact, which will not be described in detail. the

In one embodiment of the present invention, as shown in Figures 2 to 4, the transmission mechanism 10 drivingly connected with the rotating shaft 11 can be provided by a large bevel gear 102 for transmission output and a small bevel gear 101 meshing with it, and the second bearing 16 and the installation axis Y1 of the small bevel gear 101 are located on the same side of the large bevel gear 102, and the second bearing 16 is located in the size space formed by the small bevel gear 101 in its radial direction, making the internal mechanism of the machine more compact. Further, see 2 and 3, the second bearing 16 and the installation axis Y1 of the small bevel gear 101 are at the same position between the large bevel gear 102 and the impact wheel 12. The other transmission assembly 105 can even be configured such that none of its components exceeds the diameter of the motor housing (the limit shown by dashed line L in FIG. 2 ). the

In yet another embodiment of the present invention, as shown in FIG. 5 , the transmission mechanism 10 drivingly connected with the rotating shaft 11 can be provided by a first cylindrical gear 102 ′ for transmission output and a second cylindrical gear 101 ′ meshing with it, and The transmission part of the vertical steering is arranged on the small bevel gear 21 on the output shaft of the motor and the large bevel gear 103 meshed with it, because the rotation central axes of the first cylindrical gear 102' and the second cylindrical gear 101' meshed with it are parallel to each other , the left end surface of the second cylindrical gear 101' does not exceed the left end surface of the rotating shaft 11, so that the internal mechanism is more compact, and the lateral width between the two sides 321, 322 of the casing head 32 is smaller, which is more suitable for narrow spaces Hit the fasteners inside. the

Through the above-mentioned embodiments, the electric hammer of the present invention can be made very compact, and its internal structure can be arranged very compactly. In particular, the axial length of the rotating shaft 11 along its axis X direction can be controlled by rotating The distance between the left end face 111 and the right end face 112 of the shaft 11 is limited, the ratio of the axial length of the rotating shaft 11 to the diameter D of the motor 2 can be less than 1.4, when the axial length of the rotating shaft 11 is the same as that of the motor When the diameters D of 2 are equal, that is, when the ratio of the axial length of the rotating shaft 11 to the diameter D of the motor 2 is 1, the housing head 32 containing the rotating shaft 11 can be approximately the same as the grip of the motor 2. The shell surface of the handle 31 is flush. the

The electric hammer disclosed in the present invention is not limited to the content described in the above embodiments and the structures represented in the accompanying drawings. On the basis of the present invention, obvious changes, substitutions or modifications are made to the shapes and positions of the components, All within the scope of protection of the present invention. the

Claims (6)

1. electronic hammer comprises:

Casing is supported with nail hitting unit;

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

Said impact assembly comprises beater wheel and supports the jackshaft of said beater wheel; The quilt that the impact of beater wheel partly impacts said nail hitting unit impacts on the axle; Jackshaft rotatably is supported on first support member and second support member, and first support member and second support member lay respectively at the both sides of said impact assembly, and said transmission mechanism comprises first driving member and second driving member; First driving member drives with said jackshaft and is connected

It is characterized in that: the parallel axes of the axis of said first driving member and second driving member.

2. electronic hammer according to claim 1 is characterized in that: the left end face of said second driving member is no more than the left end face of said jackshaft.

3. electronic hammer according to claim 2 is characterized in that: the top is propped up flexible between the said beater wheel and first support member.

4. electronic hammer according to claim 3 is characterized in that: said elastic component and said first support member along said jackshaft axially on have staggered.

5. according to each described electronic hammer in the claim 4; It is characterized in that: first end that said first support member has near said beater wheel reaches second end away from said beater wheel, and said elastic component has end top to prop up on first end and the position between second end of said first support member.

6. electronic hammer according to claim 3 is characterized in that: said elastic component is one or several.

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