The present invention relates to a spanner for a nut, especially to a two-way nut spanner adapted to turn a nut connected on a cutter holder.
A conventional spanner is adapted to turn a nut to fasten or loosen the nut. Because the cutter tool can connect with one of various cutters, e.g. drills, milling cutters, chamfer cutters, and so on, if a cutting head of the cutter is too larger to block a socket type conventional spanner to vertically connect with the nut, a conventional spanner of a different type is used to detach the nut connected on the cutter holder.
In addition, there are various types of nuts, and one of the nuts adapted to connect on the cutter holder has multiple grooves arranged around an external peripheral surface of the nut. Each groove has an inclined groove surface extending obliquely and inwardly from an edge thereof away from an end surface of the nut to the end surface of the nut. Because of the inclined groove surfaces, the conventional spanner cannot stably engage with the grooves of the nut. Consequently, the conventional spanner is easily disengaged from the nut during rotating to turn the nut.
To overcome the shortcomings, the present invention provides a two-way nut spanner to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide a two-way nut spanner that has two types of engaging portions to loosen or fasten a nut having inclined groove surfaces.
The two-way nut spanner in accordance with the present invention comprises a handle and an engaging head formed on an end of the handle and having a central axis, a base, a first engaging portion, and a second engaging portion. The base surrounds the central axis of the engaging head to form a C-shape and has a first abutting surface and a second abutting surface respectively located at two opposite sides of the base. The first engaging portion protrudes from the first abutting surface of the base and has a first surrounding portion and multiple first engaging blocks. The first surrounding portion is C-shaped, protrudes from the first abutting surface of the base, and has a first opening. The first engaging blocks protrude from an inner surface of the first surrounding portion, and are arranged around the central axis of the engaging head at angular intervals. Each of the first engaging blocks has a first inclined surface located away from the first surrounding portion and extending obliquely from the first abutting surface of the base toward the first surrounding portion and away from the first abutting surface of the base.
The second engaging portion protrudes from the second abutting surface of the base and has a second surrounding portion and a second engaging block. The second surrounding portion is C-shaped, protrudes from the second abutting surface, and has a second opening. The second engaging block protrudes from an inner surface of the second surrounding portion, is located near one of two edges of the second opening, and has a second inclined surface located away from the second surrounding portion and extending obliquely from the second abutting surface toward the second surrounding portion and away from the second abutting surface of the base.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The engaging head 20 has a central axis A, a base 21, a first engaging portion 23, and a second engaging portion 25. The base 21 surrounds the central axis A of the engaging head 20 to form a C-shape, is formed on the end of the handle 10, and has a first abutting surface 211 and a second abutting surface 212 respectively located at two opposite sides of the base 21. The first engaging portion 23 protrudes from the first abutting surface 211 of the base 21. The second engaging portion 25 protrudes from the second abutting surface 212 of the base 21.
The first engaging portion 23 has a first surrounding portion 231 and multiple first engaging blocks 233. The first surrounding portion 231 surrounds the central axis A of the engaging head 20 to form a C-shape, protrudes from the first abutting surface 211, and has a first opening 232. The first surrounding portion 231 has a radian larger than 4π/3 and smaller than 2π. The first engaging blocks 233 protrude from an inner surface of the first surrounding portion 231 and are arranged around the central axis A of the engaging head 20 at angular intervals. Each of the first engaging blocks 233 has a first inclined surface 234 located away from the first surrounding portion 231 and extending obliquely from the first abutting surface 211 of the base 21 toward the first surrounding portion 231 and away from the first abutting surface 211 of the base 21. In this embodiment, the first engaging portion 23 has five first engaging blocks 233 arranged around the central axis A of the engaging head 20 at equiangular intervals. With reference to
With reference to
The second engaging block 253 protrudes from an inner surface of the second surrounding portion 251 and is located near one of two edges of the second opening 252. The second engaging block 253 has a second inclined surface 254 located away from the second surrounding portion 251 and extending obliquely from the second abutting surface 212 of the base 21 toward the second surrounding portion 251 and away from the second abutting surface 212 of the base 21. With reference to
Preferably, the second engaging portion 25 has a supporting block 255 protruding from the inner surface of the second surrounding portion 251 and located near the other one of the two edges of the second opening 252 away from the second engaging block 253.
With reference to
With reference to
Because the second engaging portion 25 has one single second engaging block 253, if a cutter having a large cutting head, such as a chamfer cutter, is connected on the cutter holder, the second engaging portion 25 can be laterally moved close to the nut 50, and then the second engaging block 253 is inserted and engaged in one of the grooves 52 of the nut 50. Thus, the convenience for using the second engaging portion 25 to turn the nut 50 can be enhanced. Because the second block 235 has the second inclined surface 254 and the second engaging block 253 corresponding in size and shape to each of the grooves 52 of the nut 50, the second engaging block 253 can be deeply inserted in one of the grooves 52 to increase an engaging area between the second engaging block 253 and the corresponding groove 52 and to increase engaging strength.
Preferably, with reference to
With reference to
The first engaging portion 23 has multiple first engaging blocks 233. When connected with a cutter having a small cutting head, such as a drill, the engaging head 20 can be directly and vertically putted on and connect with the nut 50. The multiple first engaging blocks 233 are inserted in and engage with the grooves 52 of the nut 50 respectively to increase engaging strength. So a user can easily apply force to the handle 10 to turn the nut 50. Because each of the first engaging blocks 233 has the first inclined surface 234 and each of the first engaging blocks 233 corresponds in size and shape to each of the grooves 52 of the nut 50, each of the first engaging blocks 233 can be deeply inserted in a corresponding one of the grooves 52 to increase an engaging area between each of the first engaging blocks 233 and the corresponding one of the grooves 52 and to increase engaging strength.
Preferably, with reference to
Preferably, the inner diameter of the first surrounding portion 231 is 0.1 millimeters to 0.3 millimeters and is larger than an external diameter of the nut 50. For example, if the external diameter of the nut 50 is 20 millimeters, the inner diameter of the first surrounding portion 231 is around 20.1 millimeters to 20.3 millimeters to reduce a gap formed between the first surrounding portion 231 and the nut 50. The first engaging portion 23 can tightly surround the nut 50.
Preferably, a width of each of the first engaging blocks 233, which is a horizontal distance between two opposite edges, is 0.1 millimeters to 0.15 millimeters and is smaller than a width of each of the grooves 52 of the nuts 50 to reduce a gap formed between each of the first engaging blocks 233 and the corresponding one of the grooves 52 of the nut 50.
With such arrangement, the two-way nut spanner in accordance with the present invention has advantages as follows:
1. Because the engaging head 20 has the first engaging portion 23 and the second engaging portion 25 with different engaging structures, a user can select one of the first engaging portion 23 and the second engaging portion 25 to detach or fasten the nut 50 according to which type of cutter is connected on the cutter holder. The convenience for using the two-way nut spanner is enhanced.
2. The first engaging blocks 233 and the second engaging block 253 correspond in shape and size to the grooves 52 of the nut 50 to deeply engage with the grooves 52 of the nut 50. The engaging stability and engaging strength of each of the first engaging blocks 233 and the second engaging block 253 engaged with each of the grooves 52 of the nut 50 can be enhanced.