EP2527097A1

EP2527097A1 - Heavy double button type multifunctional electric hammer

Info

Publication number: EP2527097A1
Application number: EP10843674A
Authority: EP
Inventors: Wenjiang Wang
Original assignee: Zhejiang Haiwang Electric Machine Co Ltd
Current assignee: Zhejiang Haiwang Electric Machine Co Ltd
Priority date: 2010-01-21
Filing date: 2010-03-10
Publication date: 2012-11-28
Also published as: CN101767327B; EP2527097A4; WO2011088632A1; CN101767327A

Abstract

A heavy double-button type multifunctional electric hammer includes a hammer body, a driving motor, a rotating sleeve group, a connecting rod subassembly and a torque spring; the electric hammer also includes a multifunctional transmission mechanism and an operating mechanism. The multifunctional transmission mechanism includes a first wheel, a first wheel clutch, a second wheel, a third wheel, an intermediate shaft, a forth wheel, a forth wheel clutch, a fifth wheel, a fifth wheel clutch, a small bevel gear, a large bevel gear, a torque clutch, an eccentric shaft and an eccentric shaft spring. The output shaft of the driving motor is connected with the first wheel and the second wheel; a small bevel gear is installed on the small bevel gear shaft; the small bevel gear is engaged with the large bevel gear; the big bevel gear is sleeved on the rotating sleeve group; the big bevel gear is matched with the torque clutch; the fourth wheel clutch, the fifth wheel clutch and the first wheel clutch are all connected with the operating mechanism. The heavy double-button type multifunctional electric hammer has the advantages of simple and proper structure, flexible and convenient transmission, low cost, safe and reliable usage.

Description

Field of the Invention

The present invention relates to an electric tool, and more specially relates to a multifunctional electric hammer.

Description of the Prior Art

With the development of the industry of power tools, people have more and more demand for the functions of power tools than ever. The four functions of electric hammer, comprising single hammering, single drilling, hammering and drilling, and single hammer angle adjustment, are well received by wide users. However, single speed has always been a shortcoming of electric hammer: inefficient with small drills in low speed and unsafe with large drills in high speed.
Although the function switch of electric hammer can be realized in two speeds, yet shortcomings exist such as complicated structure, high manufacturing cost and short service life. In single hammer angle adjustment, locking ahead of time or locking failure often happens to bring inconvenience to operators because of the unstable structure.

Summary of the Invention

Accordingly, the present invention has been keeping in mind the above shortcoming of the complicated structure, high manufacturing cost and short service life existed in electric hammer occurring in the related art, and a first object of the present invention is to provide a heavy double-button multifunctional electric hammer with simple and reasonable structure, flexible and convenient function switch, low cost, safe and reliable performance.
The technology scheme of the present invention to solve said problems:

A heavy double-button multifunctional electric hammer comprises a hammer body, a drive motor, a rotary bush assembly, a connecting rod assembly and a torque spring.
The drive motor, rotary bush assembly, connecting rod assembly and torque spring are installed on the said body. The torque spring is sleeved in the rotary bush assembly.
The connecting rod of connecting rod assembly goes through the lumen of the rotary bush assembly. The electric hammer also comprises an operating mechanism and a multifunctional transmission mechanism comprising a No. one wheel, a No. one wheel clutch, a No. two wheel, a No. three wheel, a middle shaft, a No. four wheel, a No. four wheel clutch, a No. five wheel, a No. five wheel clutch, a small bevel gear, a large bevel gear, a torque clutch, an eccentric shaft and an eccentric shaft spring. An output shaft of the drive motor is connected with No. one and No. two wheels in a transmission way. No. one wheel is installed on the eccentric shaft. No. one wheel clutch is movably installed on the eccentric shaft. No. one wheel is fitted with No. one wheel clutch. The eccentric shaft spring is installed on the eccentric shaft. The eccentric shaft is fixedly connected with the end of connecting rod assembly. No. two wheel and No. three wheel are tightly fitted on the middle shaft. An auxiliary gear on the middle shaft is engaged with No. 5 wheel. No. four and five wheels are installed on the small bevel gear shaft. No. four and five wheel clutches are movably installed on the small bevel gear shaft. No. four wheel is fitted with No. four wheel clutch, and No. five wheel with No. five wheel clutch. The small bevel gear engaged with the large bevel gear is installed on the small bevel gear shaft. The said large bevel gear fitted with the torque clutch is sleeved on the rotary bush assembly.

All No. four, No. five and No. one wheel clutches are connected with the operating mechanism.
Further, the operating mechanism comprises a stop plate spring, a stop plate, a No. four wheel paddle shifter and a No. five wheel paddle shifter, all of which are installed on the guide pillar in order. The tension springs are installed on No. four and No. five wheel paddle shifters. The tooth fitted with No. five wheel clutch is provided on the stop plate. The stop plate is positioned by a positioning pin. The large knob is provided with No. four and No. five wheel paddle shifters. The shifter slot of No. four wheel clutch is provided with No. four wheel paddle shifter. The shifter slot of No. five wheel clutch is provided with No. five wheel paddle shifter. The shifter slot of No. one wheel clutch is provided with eccentric shifter lever of small knob.
Further more, the large knob is provided on one side with three-quarter circular shifting block deviated from the center of knob. The three-quarter circular shifting block is provided with a semicircle shifting block between No. four and No. five wheel paddle shifters. The outer edge of three-quarter circular shifting block supports the positioning end of stop plate. One side of the small knob is provided with a shifter lever deviating from the center of knob.
The torque clutch and large bevel gear are provided with mating convexo-concave grooves and movably fitted. The No. one wheel and No. one wheel clutch, No. four wheel and No. four wheel clutch, No. five wheel and No. five wheel clutch are provided with mating convexo-concave grooves.
To make correct function switch, the knob is characterized by one side of the large knob being provided with a three-quarter circular shifting block deviating from the center of knob and provided with a semicircle shifting block between No. four and No. five wheel paddle shifts, and the outer edge of three-quarter circular shifting block supporting the positioning end of stop plate. One side of the small knob is provided with an eccentric shifter lever deviating from the center of knob.
To prevent overload running, the torque clutch and rotary bush assembly are hexagon positioned. The rotary bush assembly is movably fitted with the bull gear. The torque clutch and bull gear are provided with mating convexo-concave grooves.
By adopting the above-mentioned structure, a large knob through semicircular paddle shifter and three-quarter circular shifting block, and a small knob through shifting rod, fit with various states of stop plate, No. four and No. five wheel paddle shifters. No. four wheel paddle shifter can drive No. four wheel clutch to engage with or disengage from No. four wheel. No. five wheel paddle shifter can drive No. five wheel clutch to engage with or disengage from No. five wheel. Small knob can drive the shifter lever to engage with or disengage from No. one wheel clutch. Thus, the electric hammer can smoothly switch among six functions: single drilling of the first type, single drilling of the second type, single hammering, hammering and drilling of the first type, hammering and drilling of the second type, and single hammer angle adjustment.
Through torque spring, the bull gear is fitted with convexo-concave grooves of the torque clutch and is automatically disengaged when overloading in the function of hammering and drilling 1, hammering and drilling 2, single drilling 1 and single drilling 2. It is characterized by simple structure, flexible and convenient switch, low cost, safe and reliable performance.
The benefits of the present invention are characterized by simple and reasonable structure, flexible and convenient switch, low cost, safe and reliable performance.

Brief Description of the Drawings

FIG. 1 is a schematic drawing showing the structure of the present invention.
FIG. 2 is a schematic drawing of hammering and drilling of the second type of the present invention.
FIG. 3 is a schematic drawing showing the co-operation between knobs and operating mechanism in hammering and drilling of the second type of the present invention.
FIG. 4 is a schematic drawing showing hammering and drilling of the first type of the present invention.
FIG. 5 is a schematic drawing showing the co-operation between knobs and operating mechanism in hammering and drilling of the first type of the present invention.
FIG. 6 is a schematic drawing showing the structure of single hammering of the present invention.
FIG. 7 is a schematic drawing showing the co-operation between knobs and operating mechanism of single hammering of the present invention.
FIG. 8 is a schematic drawing showing the structure of single hammer angle adjustment of the present invention.
FIG. 9 is a schematic drawing showing the co-operation between knobs and operating mechanism of single hammer angle adjustment of the present invention.
FIG. 10 is a schematic drawing showing single drilling of the second type of the present invention.
FIG. 11 is a schematic drawing showing the co-operation between knobs and operating mechanism of single drilling of the second type of the present invention.
FIG. 12 is a schematic drawing showing single drilling of the first type of the present invention.
FIG. 13 is a schematic drawing showing the co-operation between knobs and operating mechanism of single drilling of the first type of the present invention.
FIG. 14 is a schematic drawing showing the structure of large knob of the present invention.
FIG. 15 is a schematic drawing showing the structure of small knob of the present invention.
FIG. 16 is a schematic drawing showing the structure of torque clutch of the present invention.
FIG. 17 is a schematic drawing showing the structure of large bevel gear of the present invention.

Description of the Preferred Embodiments

Reference will now be made in greater detail to exemplary embodiments of the invention with reference to the accompanying drawings.
With reference to FIG. 1 to FIG. 17, a heavy double-button multifunctional electric hammer comprises a hammer body, a drive motor, a rotary bush assembly, a connecting rod assembly and a torque spring. The drive motor, rotary bush assembly, connecting rod assembly and torque spring are installed on the said body. The torque spring is sleeved on the rotary bush assembly. The connecting rod of connecting rod assembly goes through the lumen of the rotary bush assembly. The electric hammer also comprises an operating mechanism and a multifunctional transmission mechanism comprising a No. one wheel 11, a No. one wheel clutch 10, a No. two wheel 5, a No. three wheel 6, a middle shaft 7, a No. four wheel 14, a No. four wheel clutch 15, a No. five wheel 13, a No. five wheel clutch 12, a small bevel gear 16, a large bevel gear 2, a torque clutch 1, an eccentric shaft 8 and an eccentric shaft spring 9.
No. four wheel 14 and No. five wheel 13 are installed on the small bevel gear shaft 16. No. four wheel clutch 15 and No. five wheel clutch 12 are movably installed on the small bevel gear shaft 16. No. four wheel 14 is fitted with No. four wheel clutch 15, and No. five wheel 13 is fitted with No. five wheel clutch 12.
The output shaft of the drive motor is connected with No. one wheel 11 and No. two wheel 5 in a transmission way. No. one wheel 11 is installed on the eccentric shaft 8. No. one wheel clutch 10 is movably installed on the eccentric shaft. No. one wheel 11 is fitted with No. one wheel clutch 10. The eccentric shaft spring 9 is installed on the eccentric shaft 8. The eccentric shaft is fixedly connected with the end of the connecting rod assembly; No. two wheel 5 and No. three wheel 6 are tightly fitted on the middle shaft 7.
The auxiliary gear on the middle shaft is engaged with No. five wheel 13. The small bevel gear engaged with the large bevel gear is installed on the small bevel gear shaft. The said large bevel gear fitted with the torque clutch 1 is sleeved on the rotary bush assembly.
No. four wheel clutch 15, No. five wheel clutch 12 and No. one wheel clutch 10 are all connected with the operating mechanism
Multifunctional electric hammer of the present invention is heavy double-button 6-functional electric hammer.
The knob is characterized by one side of the large knob 20 being provided with three-quarter circular shifting block 28 deviating from the center of knob and provided with semicircle shifting block 27 between No. four wheel paddle shift 18 and No. five wheel paddle shift 17, and the outer edge of three-quarter circular shifting block supporting the positioning end of stop plate 23. One side of the small knob 21 is provided with an eccentric shifter lever 29 deviating from the center of knob.
The torque clutch 1 and the rotary bush assembly are hexagonally positioned. The bull gear 2 and the rotary bush assembly 3 are movably fitted. The torque clutch 1 and the bull gear 2 are provided with mating convexo-concave grooves. If torque clutch 1 skids from large bevel gear 2, failing to transfer the rotating force to rotary bush assembly 3, the drill will stop for overload protection. After the load is lightened, electrical hammer will restore normal work.
Reference will now be made in greater detail to exemplary embodiments of six functions of the present invention with reference to the accompanying drawings.
The structure of hammering and drilling of the second type of the present invention is shown in the FIG. 2 and FIG. 3. The semicircle shifting block 27 on the large knob 20 is clamped between No. four paddle shifter 18 and No. five wheel paddle shifter 17. The outer edge of three-quarter circular shifting block 28 supports the positioning end of stop plate 23.
Turn the knob to hammering and drilling 2 as shown in the FIG. 2-3. Actuated by the force of the tension spring 26 and No. five wheel paddle shifter 17, No. five wheel clutch 12 is disengaged with the tooth of stop plate 23. No. five wheel clutch 12 is disengaged with No. five wheel 13. Actuated by No. four wheel paddle shifter 18, No. four wheel clutch 15 is engaged with both No. four wheel 14 and the small bevel gear 16.
Turn the small knob 21 to hammering gear and the eccentric shifter lever of small knob 29 is disengaged with No. one wheel clutch. Actuated by eccentric shaft spring 9, No. one wheel clutch 10 is engaged with No. one wheel 11.
During operation, motor output shaft drives No. one wheel 11 and No. two wheel 5 and consequently No. one wheel 11 drives No. one wheel clutch 10. No. one wheel clutch 10 drives eccentric shaft 8 and consequently eccentric shaft 8 drives connecting rod assembly 3 to realize hammering.
No. two wheel 5 drives middle shaft 7. The middle shaft 7 drives No. three wheel 6. No. three wheel 6 drives No. four wheel 14. No. four wheel 14 drives No. four wheel clutch 15. No. four wheel clutch 15 drives the small bevel gear 16. The small bevel gear 16 drives the large bevel gear 2. The large bevel gear 2 drives the torque clutch 1. The torque clutch 1 drives the connecting rod assembly 3 to realize drilling. Thus, the two functions of hammering and drilling of electric hammer are realized.
The structure of hammering and drilling of the first type of the present invention is shown in the FIG. 4 and FIG. 5. The semicircle shifting block 27 on the large knob 20 is clamped between the support of paddle shifter 18 of No. four wheel and the surface 17 of No. five wheel paddle shifter. The outer edge of three-quarter circular shifting block 28 supports the positioning end of stop plate 23.
Turn the knob to hammering and drilling 1 as shown in the FIG. 4-5. Actuated by the force of the tension spring 26 and No. five wheel paddle shifter 17, No. five wheel clutch 12 is disengaged with the tooth of stop plate 23. No. five wheel clutch 12 is engaged with No. five wheel 13 and small bevel gear 16. Actuated by No. four wheel paddle shifter 18, No. four wheel clutch 15 is disengaged with No. four wheel 14.
Turn the small knob 21 to hammering gear. The eccentric shifter lever of small knob 29 is disengaged with No. one wheel clutch. Actuated by eccentric shaft spring 9, No. one wheel clutch 10 is engaged with No. one wheel 11.
During operation, motor output shaft drives No. one wheel 11 and No. two wheel 5, and consequently No. one wheel 11 drives No. one wheel clutch 10. No. one wheel clutch 10 drives eccentric shaft 8, and consequently eccentric shaft 8 drives connecting rod assembly 3 to realize hammering.
No. two wheel 5 drives middle shaft 7. The middle shaft 7 drives No. five wheel 13. No. five wheel 13 drives No. five wheel clutch 12. No. five wheel clutch 12 drives the small bevel gear 16. The small bevel gear 16 drives the large bevel gear 2. The large bevel gear 2 drives the torque clutch 1. The torque clutch 1 drives the connecting rod assembly 3 to realize drilling. Thus, hammering and drilling 1 function of electric hammer is realized.
The structure of single hammering of the present invention is shown in the FIG. 6 and FIG. 7. The semicircle shifting block 27 on the large knob 20 is clamped between the support of paddle shifter 18 of No. four wheel and the surface 17 of No. five wheel paddle shifter. The flat surface of three-quarter circular shifting block 28 supports the stop plate 23.
Turn the knob to hammering and drilling as shown in the FIG. 6-7. Actuated by the force of the tension spring 26 and No. five wheel paddle shifter 17, No. five wheel clutch 12 is disengaged with the tooth of stop plate 23. No. five wheel clutch 12 is disengaged with No. five wheel 13. Actuated by No. four wheel paddle shifter 18, No. four wheel clutch 15 is disengaged with No. four wheel 14.
Turn the small knob 21 to hammering gear. The eccentric shifter lever of small knob 29 is disengaged with No. one wheel clutch 10. Actuated by eccentric shaft spring 9, No. one wheel clutch 10 is engaged with No. one wheel 11.
During operation, motor output shaft drives No. one wheel 11 and No. two wheel 5, and consequently No. one wheel 11 drives No. one wheel clutch 10. No. one wheel clutch 10 drives eccentric shaft 8, and consequently eccentric shaft 8 drives connecting rod assembly 3 to realize hammering.
All No. two wheel 5, the middle shaft 7, No. three wheel 6, No. four wheel 14 and No. five wheel 13 are in the state of idle running. Due to location pins 14, the stop plate 23 cannot rotate. Actuated by elastic function of stop plate spring 25, stop plate 23 is engaged with No. five wheel clutch 12. No. five wheel clutch 12 is engaged with small bevel gear 16. The small bevel gear 16 is engaged with the big bevel gear 2. The big bevel gear 2 is engaged with the torque clutch 1 and the torque clutch 1 is engaged with rotary bush assembly 3 to realize self-locking. Thus, the single hammering function of electric hammer is realized.
The structure drawing of single hammer angle adjustment of the present invention is shown in FIG. 8-9. In downtime, turn large knob 20 to the position of single hammer angle adjustment as shown in the FIG. 8-9. The stop plate 23 is fitted with the outer edge of three-quarter circular shifting block 28. The rotation radius of the semicircle shifting block 27 on the large knob 20 is not changed. The position of No. four wheel paddle shifter 18 and No. five wheel paddle shifter 17 is not changed. Actuated by three-fourths of circular shifting block 28, stop plate 23 moves down and is disengaged with No. five wheel clutch, and now No. four wheel 14 and the No. five wheel 13 are in the neutral transmission position. Turn the rotary bush assembly to adjust the angle of drills slightly to realize single hammer angle adjustment of electric hammer.
The structure of single drilling of the second type of the present invention is shown in the FIG. 10 and FIG. 11. The semicircle shifting block 27 on the large knob 20 is clamped between the support of paddle shifter 18 of No. four wheel and the surface 17 of No. five wheel paddle shifter. The outer edge of three-quarter circular shifting block 28 supports stop plate 23.
Turn the knob to hammering and drilling 2 as shown in the FIG. 2-3. Actuated by the force of the tension spring 26 and No. five wheel paddle shifter 17, No. five wheel clutch 12 is disengaged with the tooth of stop plate 23. No. five wheel clutch 12 is disengaged with No. five wheel 13. Actuated by No. four wheel paddle shifter 18, No. four wheel clutch 15 is engaged with both No. four wheel 14 and small bevel gear 16.
Turn the small knob 21 to drilling gear. Actuated by small knob 21, No. one wheel clutch 10 is disengaged with No. one wheel 11.
The output shaft of drive motor drives No. one wheel 11 and No. two wheel 5. As No. one wheel 11 is disengaged with No. one wheel clutch 10, No. one wheel 11 is in the state of idle running. The eccentric shaft 8 and the electric hammer are not working.
No. two wheel 5 drives middle shaft 7. The middle shaft 7 drives No. three wheel 6. No. three wheel 6 drives No. four wheel 14. No. four wheel 14 drives No. four wheel clutch 15. No. four wheel clutch 15 drives the small bevel gear 16. The small bevel gear 16 drives the large bevel gear 2. The large bevel gear 2 drives the torque clutch 1. The torque clutch 1 drives the connecting rod assembly 3 to realize drilling. Thus, drilling 2 function of electric hammer is realized.
The structure of single hammering of the first type of the present invention is shown in the FIG. 12 and FIG. 13. The semicircle shifting block 27 on the large knob 20 is clamped between the support of paddle shifter 18 of No. four wheel and the surface 17 of No. five wheel paddle shifter. The outer edge of three-quarter circular shifting block 28 supports stop plate 23.
Turn the knob to hammering and drilling 1 as shown in the FIG. 4-5. Actuated by the force of the tension spring 26 and No. five wheel paddle shifter 17, No. five wheel clutch 12 is disengaged with the tooth of stop plate 23. No. five wheel clutch 12 is engaged with No. five wheel 13 and small bevel gear 16. Actuated by No. four wheel paddle shifter 18, No. four wheel clutch 15 is disengaged with No. four wheel 14.
Turn the small knob 21 to drilling gear. Actuated by small knob 21, No. one wheel clutch 10 is disengaged with No. one wheel 11.
During operation, the output shaft of drive motor drives No. one wheel 11 and No. two wheel 5. As No. one wheel 11 is disengaged with No. one wheel clutch 10, No. one wheel 11 is in the state of idle running. The eccentric shaft 8 and the electric hammer are not working.
No. two wheel 5 drives middle shaft 7. The middle shaft 7 drives No. five wheel 13. No. five wheel 13 drives No. five wheel clutch 12. No. five wheel clutch 12 drives the small bevel gear 16. The small bevel gear 16 drives the large bevel gear 2. The large bevel gear 2 drives the torque clutch 1. The torque clutch 1 drives the connecting rod assembly 3 to realize drilling. Thus, drilling 1 function of electric hammer is realized.

Claims

A heavy double-button multifunctional electric hammer, comprising a hammer body, a drive motor, a rotary bush assembly, a connecting rod assembly and a torque spring; the drive motor, rotary bush assembly, connecting rod assembly and torque spring are installed on the said body; the torque spring is sleeved in the rotary bush assembly; the connecting rod of connecting rod assembly goes through the lumen of the rotary bush assembly; the electric hammer also comprises an operating mechanism and a multifunctional transmission mechanism comprising a No. one wheel, a No. one wheel clutch, a No. two wheel, a No. three wheel, a middle shaft, a No. four wheel, a No. four wheel clutch, a No. five wheel, a No. five wheel clutch, a small bevel gear, a large bevel gear, a torque clutch, an eccentric shaft and an eccentric shaft spring; an output shaft of the drive motor is connected with No. one and No. two wheels in a transmission way; no. one wheel is installed on the eccentric shaft; No. one wheel clutch is movably installed on the eccentric shaft; No. one wheel is fitted with No. one wheel clutch; the eccentric shaft spring is installed on the eccentric shaft; the eccentric shaft is fixedly connected with the end of connecting rod assembly. No; two wheel and No. three wheel are tightly fitted on the middle shaft. An auxiliary gear on the middle shaft is engaged with No. 5 wheel. No. four and five wheels are installed on the small bevel gear shaft. No. four and five wheel clutches are movably installed on the small bevel gear shaft. No. four wheel is fitted with No. four wheel clutch, and No. five wheel is fitted with No. five wheel clutch; the small bevel gear engaged with the large bevel gear is installed on the small bevel gear shaft; the said large bevel gear fitted with the torque clutch is sleeved on the rotary bush assembly ; all No. four, No. five and No. one wheel clutches are connected with the operating mechanism.
The heavy double-button multifunctional electric hammer as set forth in claim 1, wherein the said operating mechanism comprises a stop plate spring, a stop plate, a No. four wheel paddle shifter and a No. five wheel paddle shifter, all of which are installed on the guide pillar in order; the tension springs are installed on No. four and No. five wheel paddle shifters; the tooth fitted with No. five wheel clutch is provided on the stop plate; the stop plate is positioned by a positioning pin; the large knob is provided with No. four and No. five wheel paddle shifters; the shifter slot of No. four wheel clutch is provided with No. four wheel paddle shifter; the shifter slot of No. five wheel clutch is provided with No. five wheel paddle shifter, the shifter slot of No. one wheel clutch is provided with eccentric shifter lever of small knob.
The heavy double-button multifunctional electric hammer as set forth in claim 2, wherein the large knob is provided on one side with three-quarter circular shifting block deviated from the center of knob; the three-quarter circular shifting block is provided with semicircle shifting block between No. four and No. five wheel paddle shifters; the outer edge of three-quarter circular shifting block supports the positioning end of stop plate; one side of the small knob is provided with a shifter lever deviating from the center of knob.
The heavy double-button multifunctional electric hammer as set forth in one of the claim 1~3, wherein the torque clutch and large bevel gear are provided with mating convexo-concave grooves and dynamically fitted with each other; the No. one wheel and No. one wheel clutch, No. four wheel and No. four wheel clutch, No. five wheel and No. five wheel clutch are provided with mating convexo-concave grooves.