초록 ▼

A handheld power tool having a detachable tool head is disclosed in which, depending on the type of tool head used, selection of reverse movement of the rotary assembly of the power tool can be prevented. Where reverse movement of the tool head is undesirable, such as for a saw blade, the tool head

A handheld power tool having a detachable tool head is disclosed in which, depending on the type of tool head used, selection of reverse movement of the rotary assembly of the power tool can be prevented. Where reverse movement of the tool head is undesirable, such as for a saw blade, the tool head contains a contact plate that slides a plate member to a position to prevent selection of the reverse direction by the user. However, where reverse movement of a tool head is desired, such as for a drill head, the plate member remains in its original position such that forward and reverse directions can be selected by a user.

대표청구항 ▼

1. A handheld power tool comprising: a handle;a tool housing;a rotary assembly located within the tool housing and capable of rotating a shaft in a forward and reverse direction;a plate member having an opening located therein;a detachable tool head couplable to the rotary assembly and the tool hous

1. A handheld power tool comprising: a handle;a tool housing;a rotary assembly located within the tool housing and capable of rotating a shaft in a forward and reverse direction;a plate member having an opening located therein;a detachable tool head couplable to the rotary assembly and the tool housing, the tool head having a contact plate capable of contacting the plate member; anda retainer pin positioned within the opening of the plate member, the retainer pin coupled to a direction-selection switch;wherein upon axial movement of the plate member by the contacting plate the opening in the plate member limits movement of the retainer pin and selection of an operating direction by the direction-selection switch. 2. The handheld power tool of claim 1, wherein movement of the plate member depends on the type of tool head coupled to the tool housing and rotary assembly. 3. The handheld power tool of claim 1, wherein the handle further comprises a trigger switch for activating the rotary assembly. 4. The handheld power tool of claim 1, wherein when a sanding head, a jigsaw head or a circular saw head are coupled to the power tool, the plate member slides in an axial direction such that the retainer pin is located adjacent to a first end of the plate member. 5. The handheld power tool of claim 4, wherein the shaft is prevented from a reverse motion when the sanding head, jigsaw head or circular saw head is coupled to the power tool. 6. The handheld power tool of claim 1, wherein the pin is moved to a neutral position from a reverse position when a tool head having a contact plate is coupled with the rotary assembly. 7. The handheld power tool of claim 1, wherein the rotary assembly is permitted to operate in a reverse motion when a drill head is attached. 8. The handheld power tool of claim 1, wherein the plate member permits forward and reverse motion of the rotary assembly when no tool head is attached to the rotary assembly. 9. A handheld power tool comprising: a tool housing;a rotary assembly located within the tool housing and capable of rotating a shaft in a forward and reverse direction;a plate member located within the tool housing and having an opening therein;a detachable tool head coupled to at least the rotor assembly, the detachable tool head having a contact plate capable of contacting the plate member; and,a retaining pin positioned within the opening of the plate member, the retaining pin coupled to a direction-selection switch;wherein the plate member is biased in a nominal position thereby allowing for lateral movement of the retaining pin for selection of the forward or reverse direction for the shaft. 10. The handheld power tool of claim 9, wherein the contact plate of the detachable tool head does not contact the plate member. 11. The handheld power tool of claim 9, further comprising a spring located adjacent an end of the plate member, wherein the spring biases the plate member in the nominal position, wherein the detachable tool head has a contact plate in contact with the plate member, thereby compressing the spring and adjusting location of the plate member from the nominal position, to restrict the lateral movement of the retaining pin. 12. The handheld power tool of claim 11, wherein the rotor assembly is limited to movement in a forward direction. 13. A handheld power tool comprising: a handle;a tool housing;a rotary assembly located within the tool housing and capable of rotating a shaft in a forward and reverse direction;a plate member for controlling rotation direction of the rotor assembly comprising: a planar member having a thickness; andan opening extending through the thickness and located within the planar member, the opening having: a first edge having a first length;a second edge opposite to the first edge and having a second length longer than the first length;a third edge extending between and connecting the first edge and the second edge;a plurality of fourth edges opposite to the third edge, one of the fourth edges connected to the first edge and another of the fourth edges connected to the second edge;a fifth edge extending between the fourth edges and oriented at an angle relative to the fourth edges;a detachable tool head coupleable to the rotary assembly and tool housing, the tool head having a contact plate capable of contacting the plate member; anda retainer pin positioned within the opening of the plate member, the retainer pin coupled to a direction-selection switch;wherein the plate member is capable of translating axially in order to limit directional rotation of the rotary assembly. 14. The handheld power tool of claim 13, wherein the plate member is capable of sliding between multiple positions and wherein the retainer pin is capable of moving between two positions along the first edge and between three positions along the second edge. 15. The handheld power tool of claim 14 further comprising a spring adjacent an end of the plate member. 16. The handheld power tool of claim 15, wherein the contact plate causes the plate member to compress the spring at an end of the plate member opposite the contact plate. 17. The handheld power tool of claim 16, wherein when the plate member compresses the spring, the retainer pin is located adjacent the first edge of the plate member. 18. The handheld power tool of claim 17, wherein the rotating shaft is limited to movement in the forward direction. 19. The handheld power tool of claim 15, wherein when the spring is in an uncompressed state, the retainer pin is located adjacent the second edge of the plate member. 20. The handheld power tool of claim 19, wherein the retainer pin is movable within the opening, when located adjacent the second edge, to operate the direction-selection switch and to dictate movement of the rotating shaft in the forward or reverse directions.