专利汇可以提供Hammer Drill专利检索,专利查询,专利分析的服务。并且A hammer drill (1) comprises a motor (9) including a motor output shaft (11), a hollow spindle (13), a hammer mechanism comprising a piston (17) arranged for reciprocating motion within the hollow spindle (13), and an intermediate shaft assembly (23) rotationally engaged with the motor output shaft (11). The intermediate shaft assembly (23) comprises a first part (25), a second part (27)and a connecting part (29). The first part (25) carries a first gear (31) which is in engagement with a second gear (35) on the hollow spindle (13) to cause rotation of the spindle (1). The second part (27) carries a crank member (37) arranged to cause the reciprocating motion of the piston (17). The connecting part (29) is arranged for movement with respect to the first and second parts (25, 27) to rotationally interconnect, or disconnect, the first and second parts (25, 27). In a first position of the connecting part (29) only one of the first and second parts (25, 27) is rotationally engaged with the motor output shaft (11) to enable rotation of only one of the first gear (31) and the crank member (37) respectively. In a second position of the connecting part (29) both of the first and second parts (25, 27) are rotationally engaged with the motor output shaft (11) to enable rotation of both the first gear (31) and the crank member (37).,下面是Hammer Drill专利的具体信息内容。
The present invention relates to a hammer drill according to the preamble of claim 1, and especially to mode change arrangements of hammer drills. Such a hammer drill is known from
European Patent Application
The first part of the intermediate shaft assembly preferably comprises a hollow part, and the second part preferably extends at least partly through the first part.
Advantageously, the first part may carry a driven gear which is in engagement with the motor output shaft and which is arranged to rotate the first part when the motor output shaft rotates in use.
The first gear preferably is formed in a single piece with the first part, but alternatively the first gear could be a separate part attached to the first part. The second gear may be formed in a single piece with the hollow spindle, but preferably the second gear is a separate part attached to the spindle. The first gear and/or the second gear preferably comprise a bevel gear, and more preferably both the first and second gears comprise bevel gears. Alternatively, however, either the first gear or the second gear may comprise a bevel gear in the form of a crown gear (i.e. a bevel gear in which the pitch angle is ninety degrees), and the other gear may comprise a conventional gear, for example.
The second part of the intermediate shaft assembly preferably comprises a shaft which extends at least partly through the first part and preferably beyond two opposite ends of the first part. The crank member preferably is located at one end region of the second part which extends beyond an end of the first part. A region of the second part on which the connecting part is located, or locatable, preferably comprises one end region of the second part which extends beyond an end of the first part. The end region of the second part on which the connecting part preferably is located, or locatable, preferably is the opposite end region to the end region of the second part at which the crank member is located.
According to the invention, when the connecting part of the intermediate shaft assembly is in its first position the connecting part is located on only the second part, and when the connecting part is in its second position the connecting part is located on both of the first and second parts. Accordingly, when the connecting part is in its first position the connecting part is located on only the second part, to enable rotation of only the first gear and not the crank member. The connecting part preferably comprises a hollow part located on the first part and/or the second part.
The hammer drill of the first aspect of the invention preferably further comprises a movable linkage arrangement configured to move the connecting part of the intermediate shaft assembly between its first and second positions. More preferably, the hammer drill further comprises a mode change collar rotatably mounted on a housing of the hammer drill and configured such that rotation of the mode change collar causes the movable linkage arrangement to move the connecting part between its first and second positions.
The movable linkage arrangement of the invention may, for example, comprise a pivoting arm. Advantageously, the movable linkage arrangement may comprise an elongate member configured to pivot the pivoting arm. The mode change collar preferably includes a cam surface configured such that rotation of the mode change collar causes the elongate member to move. The pivoting arm preferably is spring-biased towards the elongate member and the mode change collar.
Preferred embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, of which:
The pneumatic hammer mechanism of the hammer drill 1 comprises a piston 17 located in the hollow spindle 13 and arranged for reciprocating motion. Also located in the hollow spindle 13 and arranged for reciprocating motion are a ram 19 and a beat piece 21. As already mentioned, the pneumatic hammer mechanism comprising the piston 17, ram 19 and beat piece 21 are conventional, and so will not be described further. The hammer drill 1 also includes an intermediate shaft assembly 23 which is shown more clearly in
The intermediate shaft assembly 23 of the hammer drill 1 comprises a hollow first part 25, an elongate second part 27 extending through the first part, and a hollow connecting part 29 movably located on the first and second parts.
The first part 25 of the intermediate shaft assembly 23 carries a driven gear 31 which is press-fit thereon (but which could instead be integral therewith) and which is in engagement with the motor output shaft 11. Consequently, when the motor output shaft 11 rotates in use, the first part 25 of the intermediate shaft assembly 23 also rotates. The first part 25 also carries a first gear 33 which is in engagement with a second gear 35 on the hollow spindle 13 to cause rotation of the hollow spindle when the motor output shaft 11 rotates in use. In the illustrated embodiment of the invention, both the first and second gears are bevel gears, but instead one of the gears may be a crown gear and the other gear may be a conventional gear, for example. Also in the illustrated embodiment, the first gear 33 is formed in a single piece with the first part 25 of the intermediate shaft assembly, and the second gear 35 is a separate part which is attached to the hollow spindle 13. However, in alternative embodiments both the first and second gears may be formed integrally with the components carrying them (the first part 25 and the hollow spindle 13, respectively) or the first gear 33 may be a separate component which is attached to the first part 25 and the second gear 35 may be formed integrally with the hollow spindle 13.
The second part 27 of the intermediate shaft assembly 23 is in the form of a shaft and carries a crank member 37 which is arranged to cause the reciprocating motion of the piston 17. An eccentrically located crank pin 39 of the crank member 37 is connected to a connecting rod 41 which interconnects the crank member 37 with the piston 17, in a conventional manner. The crank member 37 is attached to (e.g. press-fit on) the second part 27, but could instead be integrally formed therewith. The crank member 37 is located adjacent to the first gear 33, on an end region 43 of the second part 27 which extends beyond an end of the first part 25.
The hollow connecting part 29 of the intermediate shaft assembly 23 is movably located on an opposite end region 45 of the second part 27. As most clearly shown in views 2(b), 2(c) and 3(b), the end region 45 of the second part 27, and an adjacent region 47 of the first part 25, include matching splines 49 and 50, respectively. Additionally, the end region 45 of the second part 27 has an increased diameter to match the diameter of the adjacent region 47 of the first part 25. The hollow connecting part 29 has the form of a ring, the internal surface 51 of which includes splines which are configured to locate between the corresponding splines of the first and second parts.
As shown in
As shown in
The hollow connecting part 29 is movable with respect to the first part 25 and second part 27 of the intermediate shaft assembly 23 by means of a movable linkage arrangement 53. The movable linkage arrangement 53 comprises a pivoting arm 55 and a substantially rigid elongate member 56. The pivoting arm 55 is arranged to pivot about a pivot rod 57, opposite ends of the pivot rod being rotatably located in corresponding recesses in an inner housing 59 of the hammer drill 1. The pivoting arm 55 has two opposite end portions, a first of which comprises a pair of end members 61 located in a groove 63 provided on the exterior of the hollow connecting part 29, and the second end portion 65 of the pivoting arm abuts an end of the elongate member 56. The pivoting arm 55 is spring-biased by means of a spring 67 such that the second end portion 65 is biased towards the elongate member 56. As shown in
As best shown in
It will be understood that the above description and the drawings are of particular examples of the invention, but that other examples of the invention are included in the scope of the claims.
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