Hand power tool

• US 7,455,488 B2
• Filed: 10/28/2004
• Issued: 11/25/2008
• Est. Priority Date: 12/18/2003
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Carlson, Carl Christian, Jalil, Rezwan Iskandar, Braun, Marco, Razlan, Roshilawati, Thong, Wooi Ken
• Primary Examiner(s): Ross; Dana
• Application Number:
  US10/572,787
• Publication Number:
  US 20070065245A1
• Time in Patent Office: 1,489 Days
• Field of Search: 409/181, 409/182, 409/134, 409/210, 303/81, 451/359, 173/128, 173/217
• US Class Current: 409/182
• CPC Class Codes: B23Q 16/024 and by converting a continuous movement into a linear indexing movement
• CPC Class Codes: B23Q 16/08 having means for clamping the relatively movable parts together in the indexed position
• CPC Class Codes: B23Q 17/2233 for adjusting the tool relative to the workpiece
• CPC Class Codes: B27C 5/10 Portable hand-operated wood-milling machines; Routers
• CPC Class Codes: Y10T 409/30392 with means to protect operative or machine [e.g., guard, safety device, etc.]
• CPC Class Codes: Y10T 409/306608 End mill [e.g., router, etc.]
• CPC Class Codes: Y10T 409/308176 with position indicator or limit means

Abstract

A hand power tool has a housing and a cutting tool bit, as well as a guard, which embraces the tool bit and is coupleable to the housing and axially adjustable relative to it, wherein the housing and the guard means, in a first adjusting position, are positionable axially freely and in a second adjusting position, guided by an adjusting element are positionable axially finely and lockably to one another, wherein the adjusting element is configured to prevent free axial displacement of the guard in the second adjusting position.

Claims

1. A hand power tool, having a housing (12) and a cutting tool bit (15), as well as having a guard means, which embraces the cutting tool bit (15) and is coupleable to the housing (12) and axially adjustable relative to it, wherein the housing (12) and the guard means, in a first adjusting position, are positionable axially freely and in a second adjusting position, guided by adjusting means, are positionable axially finely and lockably to one another, wherein the adjusting means is configured to prevent free axial displacement of the guard means in the second adjusting position and wherein the adjusting positions are rapidly changeable by means of a relative motion between the guard means and the housing (12).

2. The hand power tool in accordance with claim 1, wherein the relative motion is a rotary motion between the guard means and the housing (12), in particular limited by a short rotational course.

3. The hand power tool in accordance with claim 1, wherein the guard means is designed as a supporting foot (22), which annularly embraces the housing (12) and can be put into two predetermined rotary positions, which define one fine adjustment stage and one coarse adjustment stage for varying the axial position of the housing (12) relative to the supporting foot (22).

4. The hand power tool in accordance with claim 3, wherein the two rotary positions are limited in overlocking fashion, in particular directly next to one another, with a minimal rotational course of the housing (12) relative to the supporting foot (22).

5. The hand power tool in accordance with claim 3, wherein overlocking means (36, 37) that secure every adjustment stage against unintentional change are located between the housing (12) and the supporting foot (22).

6. The hand power tool in accordance with claim 3, wherein the housing (12) has a collar, onto which the supporting foot (22) can be slipped in telescoping fashion, and the outer contour of the housing (12) merges flush with that of the completely slipped-on supporting foot (22), and in this position of the housing (12) relative to the supporting foot (22), the minimal telescoping extension position and hence a maximum cutting depth for the tool bit (15) are set.

7. The hand power tool in accordance with claim 3, wherein located between the housing (12) and the supporting foot (22) is a depth stop (34), which in the first adjustment stage does not and in the second adjustment stage does lockingly engage the inside of the housing (12) and the supporting foot (22).

8. The hand power tool in accordance with claim 7, wherein the depth stop (34) is designed as a screw bolt, on one end of which a control wheel (28) is seated in a manner fixed against relative rotation, with which control wheel the depth stop (34) is located rotatably and axially secured in the supporting foot (22).

9. The hand power tool in accordance with claim 8, wherein the control wheel (28) reaches outward, in particular in a manually operable way, through the supporting foot (22), and in particular its sleevelike wall (23), and the screw bolt (35) rests in form-locking fashion over approximately half its length in a longitudinally parallel groove (33) in the inside of the wall (23) of the supporting foot (22) and with its radially protruding lengthwise region rests on the diametrically opposite side in an outer longitudinal housing groove (38) that is parallel to the groove (33).

10. The hand power tool in accordance with claim 3, wherein it is capable of being set down, in freestanding fashion, on a horizontal, level surface, with the aid of the supporting foot (22).

11. The hand power tool in accordance with claim 3, wherein the housing (12) and the supporting foot (22) are secured against unintentional release from one another, in particular by a bayonet mount or stop means.

12. The hand power tool in accordance with claim 3, wherein scale means (53) are located between the housing (12) and the supporting foot (22) for indicating the cutting depth.

13. The hand power tool in accordance with claim 3, wherein the supporting foot (22), particularly on the top side of its foot plate (26), has at least one indentation with an upward-protruding edge and with a nonslip surface structure which in particular is provided with rectangular impressions and which serves as a finger rest with a touch guard protecting the finger against the tool bit (15) when the supporting foot (22) is guided and held by hand in milling work.

14. The hand power tool in accordance with claim 1, wherein the adjusting positions are axially and radially fixable and releasable, in particular by clamping means (25, 30).

15. The hand power tool in accordance with claim 1, wherein it is designed as a top spindle molder, and the adjusting positions can be associated with a predeterminded cutting depth.

16. The hand power tool in accordance with claim 1, wherein a power cord (16) emerges from the housing (12) radially, to the rear, and angled upward.

17. A hand power tool, having a housing (12) and a cutting tool bit (15), as well as having a guard means designed as a supporting foot (22), which embraces the cutting tool bit (15) and is coupleable to the housing (12) and axially adjustable relative to it, wherein:

the housing (12) and the supporting foot (22), in a first adjusting position, are positionable axially freely and in a second adjusting position, guided by adjusting means, are positionable axially finely and lockably to one another;

the adjusting means is configured to prevent free axial displacement of the guard means in the second adjusting position;

located between the housing (12) and the supporting foot (22) is a depth stop (34), which in the first adjustment stage does not and in the second adjustment stage does lockingly engage the inside of the housing (12) and the supporting foot (22);

the depth stop (34) is designed as a screw bolt, on one end of which a control wheel (28) is seated in a manner fixed against relative rotation, with which control wheel the depth stop (34) is located rotatably and axially secured in the supporting foot (22);

the control wheel (28) reaches outward, in a manually operable way, through the supporting foot (22), and its sleevelike wall (23), and the screw bolt (35) rests in form-locking fashion over approximately half its length in a longitudinally parallel groove (33) in the inside of the wall (23) of the supporting foot (22) and with its radially protruding lengthwise region rests on the diametrically opposite side in an outer longitudinal housing groove (38) that is parallel to the groove (33); and

a further longitudinal housing groove (40), with the same radius of curvature, is located next to the one longitudinal housing groove (38), and the screw bolt (35) can be longitudinally placed in this further longitudinal housing groove.

18. The hand power tool in accordance with claim 17, wherein the longitudinal housing grooves (38, 40) are directly next to each other and can be put into a parallel overlocking engagement with the screw bolt (35) selectively by rotating the supporting foot (22) relative to the housing (12).

19. The hand power tool in accordance with claim 18, wherein the center spacing of the longitudinal housing grooves (38, 40) is less than twice their radius of curvature.

20. The hand power tool in accordance with claim 19, wherein overlocking means are located between the longitudinal housing grooves (38, 40) and seek to keep the screw bolt (35) positionally secure in prestressed fashion in its respective longitudinal housing groove (38, 40).

21. The hand power tool in accordance with claim 20, wherein one of the longitudinal housing grooves (38, 40) has fitting threaded means (50) or the like that are capable of engaging the inside of the screw bolt (35).

22. The hand power tool in accordance with claim 21, wherein the other of the longitudinal housing grooves (38, 40) embraces the screw bolt (34) with little contact, and in particular with radial play.

23. The hand power tool in accordance with claim 22, wherein between the longitudinal housing grooves (38, 40), as overlocking means a bolt (36) is braceable, radially spring-prestressed outward, longitudinally against the screw bolt (35), and in particular is retained in captive fashion in a slot in the housing wall (13).

24. The hand power tool in accordance with claim 23, wherein the collar (20) of the housing (12) and/or the upper edge (21), braceable thereon, of the sleevelike shaft of the supporting foot (22) extends obliquely.