Source: http://www.google.com/patents/US5052497?dq=5463388
Timestamp: 2016-06-28 18:49:05
Document Index: 795801333

Matched Legal Cases: ['art 70', 'art 71', 'art 70', 'art 71', 'arts 73', 'arts 73', 'arts 75', 'art 88']

Patent US5052497 - Apparatus for driving a drilling or percussion tool - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThis invention relates to a device for driving a drilling or percussion tool having a spindle that rotates with respect to a housing. One end of the spindle is adapted to fasten to a tool piece and the other end is connected to an osciliating percussion body movable in the housing by means of a guideway....http://www.google.com/patents/US5052497?utm_source=gb-gplus-sharePatent US5052497 - Apparatus for driving a drilling or percussion toolAdvanced Patent SearchPublication numberUS5052497 APublication typeGrantApplication numberUS 07/360,316Publication dateOct 1, 1991Filing dateJun 2, 1989Priority dateJun 7, 1988Fee statusLapsedAlso published asCA1326380C, DE68918335D1, DE68918335T2, EP0345896A2, EP0345896A3, EP0345896B1, US5113951Publication number07360316, 360316, US 5052497 A, US 5052497A, US-A-5052497, US5052497 A, US5052497AInventorsJ. P. Houben, A. J. MoolenaarOriginal AssigneeEmerson Electric CompanyExport CitationBiBTeX, EndNote, RefManPatent Citations (5), Referenced by (77), Classifications (36), Legal Events (8) External Links: USPTO, USPTO Assignment, EspacenetApparatus for driving a drilling or percussion tool
US 5052497 AAbstract
This invention relates to a device for driving a drilling or percussion tool having a spindle that rotates with respect to a housing. One end of the spindle is adapted to fasten to a tool piece and the other end is connected to an osciliating percussion body movable in the housing by means of a guideway. A drive shaft rotates the tool spindle into rotation or actuates the percussion body via a transmission that is provided with means for converting the rotary motion of the drive shaft into an oscillatory motion of a drive member. The drive member is connected to the percussion body through an elastic member having a non-linear spring characteristic.
1. Apparatus for driving a percussion tool provided with a spindle held rotatably in a housing, said spindle having a first end and a second end, the first end is suitable for fastening to said tool and the second end is accessible to an oscillating percussion body movable in said housing by means of a guideway, a rotatable driving shaft actuates said percussion body by a transmission, said transmission being Provided with means for conversion of the rotary motion of the drive shaft into an oscillatory motion of an associated drive member, said drive member joining said percussion body through an associated elastic member having non-linear spring attributes, characterized in that said drive member has a plate-like member, said drive member is mounted on the drive shaft, said elastic member is operatively connected to said plate-like member and is provided with a coupling means for engaging said percussion body.
2. The apparatus of claim 1 wherein said drive member is operatively mounted at, or can be adjusted to, an angle deviating 90 degrees from the center line of said drive shaft, said plate-like member being rotatably arranged on said drive member.
3. The apparatus of claim 2 wherein said coupling means has a tongue fastened to said plate-like member, which protrudes into an aperature, said aperature having a stroke direction, disposed in the percussion body.
4. The apparatus of claim 3 wherein said aperature has in said stroke direction a larger diversion than the thickness of said tongue.
5. The apparatus of claim 3 wherein said tongue is the end of a circuitous-shaped spring arm.
6. The apparatus of claim 1 wherein said coupling means has a tongue fastened to said plate-like member, which protrudes into an aperature, said aperature having a stroke direction, disposed in the percussion body.
7. The apparatus of claim 6 wherein said aperature has in said stroke direction a larger dimension than the thickness of said tongue.
8. The apparatus of claim 6 wherein said tongue is the end of a circuitous-shaped spring arm.
9. The apparatus of claim 1 wherein said elastic body spring plate is arranged so that the spring constant is less than that of said elastic member.
10. The apparatus of claim 1 wherein said plate-like member is mounted rotatably on a drive member embodied around the axis as a support member.
11. The apparatus of claim 10 wherein said support member is mounted tiltably with respect to said axis.
12. The apparatus of claim 1 wherein said percussion body is a pin freely movable with respect to said housing.
13. The apparatus of claim 12 wherein said percussion body is held in Place by a plurality of slide bearings supported by said housing.
14. The apparatus of claim 12 wherein said percussion body is suspended in said housing by means of one or more spring strip members.
15. The apparatus of claim 14 wherein at least one pair of parallel spring strip members are arranged around said percussion body.
16. The apparatus of claim 12 wherein said percussion body is accommodated in a drilled hole made in said spindle.
17. The apparatus of claim 1 wherein said drive member has a bearing motor shaft which has a coupling on the side of the driving motor.
18. The apparatus of claim 17 wherein said coupling in said drive shaft is of the groove and tongue type and is arranged close to a supporting bearing.
19. The apparatus of claim 1 wherein a coupling is incorporated between the drive element and the shaft that carries said drive element, said coupling capable of being engaged and released independently of the rotation of said drive shaft.
20. The apparatus of claim 19 wherein said coupling can be actuated by means of an axial displacement of said spindle.
21. The apparatus of claim 19 wherein said coupling is a slip clutch and is provided with a plurality of ball members.
22. The apparatus of claim 1 wherein said spindle is provided with a transmission gear wheel freely rotatable with respect thereto, and a hand-operated coupling is arranged between said spindle and said gear wheel.
23. The apparatus of claim 22 wherein said coupling is embodied as a friction-slip clutch.
24. The apparatus of claim 23 wherein one or more of the intake passageways is suitable for the receiving of an air conduit tube, said air conduit tube optionally provided with a filter.
25. The apparatus of claim 1 wherein said housing is divided into compartments by means of partitions wherein one or more partitions has a passageway for the venting of air, said air stream is a result of the blade wheel member of the electric motor.
26. The apparatus of claim 25 wherein said blade wheel member is embodied in twin form.
27. The apparatus of claim 1 wherein said spindle has an end face and is provided with a holding device for said tool, which holding device is so disposed that said tool comes into direct contact with the end face of the spindle.
28. The apparatus of claim 27 wherein said holding device is provided with coupling means for, at one side, said spindle and, at the other side, for said tool, which excludes a rotation, but permits an axial displacement.
29. The apparatus of claim 28 wherein said coupling means are formed by roller bodies accommodated in recesses, whereof at least some of said recesses display an axial length which is greater than the length of said roller bodies.
30. Apparatus for driving a combination drilling and percussion tool provided with a spindle held rotatably in a housing, said spindle having a first end and a second end, the first end is suitable for fastening to said tool and the second end is accessible to an oscillating percussion body movable in said housing by means of a guideway, a rotatable driving shaft actuates said percussion body by a transmission, said transmission being provided with means for conversion of the rotary motion of the drive shaft into an oscillatory motion of an associated drive member, said drive member joining said percussion body through an associated elastic member having non-linear spring attributes, characterized in that said drive member has a plate-like member, said drive member is mounted on the drive shaft, said elastic member is operatively connected to said plate-like member and is provided with a coupling means for engaging said percussion body.
31. The apparatus of claim 30 wherein said drive member is operatively mounted at, or can be adjusted to, an angle deviating 90 degrees from the center line of said drive shaft, said plate-like member being rotatably arranged on said drive member.
32. The apparatus of claim 31 wherein said coupling means has a tongue fastened to said plate-like member, which protrudes into an aperature, said aperature having a stroke direction, disposed in the percussion body.
33. The apparatus of claim 31 wherein said aperature has in said stroke direction a larger dimension than the thickness of said tongue.
34. The apparatus of claim 31 wherein said tongue is the end of a circuitous-shaped spring arm.
35. The apparatus of claim 30 wherein said coupling means has a tongue fastened to said plate-like member, which protrudes into an aperature, said aperature having a stroke direction, disposed in the percussion body.
36. The apparatus of claim 35 wherein said aperature has in said stroke direction a larger dimension than the thickness of said tongue.
37. The apparatus of claim 35 wherein said tongue is the end of a circuitous-shaped spring arm.
38. The apparatus of claim 30 wherein said elastic body spring plate is arranged so that the spring constant is less than that of said elastic member.
39. The apparatus of claim 30 wherein said plate-like member is mounted rotatably on a drive member embodied around the axis as a support member.
40. The apparatus of claim 39 wherein said support member is mounted tiltably with respect to said axis.
41. The apparatus of claim 30 wherein said percussion body is a pin freely movable with respect to said housing.
42. The apparatus of claim 41 wherein said percussion body is held in place by a plurality of slide bearings supported by said housing.
43. The apparatus of claim 41 wherein said percussion body is suspended in said housing by means of one or more spring strip members.
44. The apparatus of claim 43 wherein at least one pair of parallel spring strip members are arranged around said percussion body.
45. The apparatus of claim 41 wherein said percussion body is accommodated in a drilled hole made in said spindle.
46. The apparatus of claim 30 wherein said drive member has a bearing motor shaft which has a coupling on the side of the driving motor.
47. The apparatus of claim 46 wherein said coupling in said drive shaft is of the groove and tongue type and is arranged close to a supporting bearing.
48. The apparatus of claim 30 wherein a coupling is incorporated between the drive element and the shaft that carries said drive element, said coupling capable of being engaged and released independently of the rotation of said drive shaft.
49. The apparatus of claim 48 wherein said coupling can be actuated by means of an axial displacement of said spindle.
50. The apparatus of claim 48 wherein said coupling is a slip clutch and is provided with a plurality of ball members.
51. The apparatus of claim 30 wherein said spindle is provided with a transmission gear wheel freely rotatable with respect thereto, and a hand-operated coupling is arranged between said spindle and said gear wheel.
52. Apparatus of claim 51 wherein said coupling is embodied as a friction-slip clutch.
53. The apparatus of claim 30 wherein said housing is divided into compartments by means of partitions characterized in that one or more partitions has a passageway for the venting of air, said air stream is a result of the blade wheel member of the electric motor.
54. The apparatus of claim 53 wherein said blade wheel member is embodied in twin form.
55. The apparatus of claim 54 wherein one or more of the intake passageways is suitable for the receiving of an
56. The apparatus of claim 30 wherein said spindle has an end face and is provided with a holding device for said tool, which holding device is so disposed that said tool comes into direct contact with the end face of the spindle.
57. The apparatus of claim 56 wherein said holding device is provided with coupling means for, at one side, said spindle and, at the other side, for said tool, which excludes a rotation, but permits an axial displacement.
58. The apparatus of claim 57 wherein said coupling means are formed by roller bodies accommodated in recesses, whereof at least some of said recesses display an axial length which is greater than the length of said roller bodies.
In another embodiment there is arranged extending along the elastic member a spring plate wherein the spring constant is less than that of the elastic member Since the spring plate will be cushioned during the movement to a greater or lesser extent against the elastic member, a non-linear spring characteristic results.
Reference number 1 indicates the housing of an electric drilling tool which comprises in the usual way a electric motor 2, for instance the collector type, and also cooperating with the drive shaft 3 is transmission 4 in the form of a double gear wheel drive and a tool spindle 5. A tool (not shown) can be fastened at the free end of the tool spindle 5 in arbitrary manner. At the opposite inner end of the tool spindle 5 an extension thereof there is included a percussion body 6 which is movable through slide bearings 7 to and fro in the housing 1 in a freely slidable way. The driving of the percussion body 6 for engendering reciprocating movement thereof is possible by means of a driving body 8 with an associated elastic member 9, whereof the construction and the operation will be further elucidated hereinbelow.
It is further observed that tool spindle 5 is mounted to a certain extent axially slidably in the bearing of the housing, so that on the impression of tool spindles in the direction of arrow Pl, gear wheel 18 is carried therewith to the right, which slides sleeve 15 along to the right and causes member 14 of the dog clutch to engage with member 13 and thus with drive member 8.
The elastic plate-shaped member 9 has a bushing through which percussion body 6 is freely movably housed, whereby it is to be understood that body 6 displays a notch 20 at the level of the plate. Into this notch projects tongue 21 of plate 9 (see FIG. 4), this and other matters being so arranged that on reciprocating motion of plate 9 from Position A to position B, and vice versa, tongue 21 thrusts against the end faces of notch 20, through which percussion body 6 is carried in a retarded manner along with the motion of plate 9. The dimensioning of the stroke of plate 9 is such that percussion body 6 repeatedly hits against the free end of tool spindle 5, whereby a hammering effect results.
In particular embodiments it can be advantageous to arrange a second elastic plate next to elastic plate 9, as is indicated by 26 in FIG. 1. The second elastic plate 26 (see also FIGS. 3 and 4) has a more pliant spring characteristic and therefore a lower spring constant than plate 9. In the interval AB the spring characteristic indicated by lines 24" and 25" will, for example, be followed until plate 9 cooperates. The lines 24" and 25" intersect the S axis at points C and D. The distance CD is the clearance between the spring systems and notch 20 of percussion body 6. A construction of the kind will at least cause the sharp angle between the segments BA and 24 to take a smoother course, as is indicated by-line segment 27. If there is also a second spring plate 26 arranged to the right side of plate 9, this smoothed course can equally be brought about on the left-hand side of the vertical axis of the system in FIG. 2 according to line 27.
To this embodiment percussion body 6 is not made with a notch but with two projections 20' which are arranged at a distance from each other. In the space between the projections 20', a tongue 21 of plate 9 can project. In this embodiment the plate is provided on both sides with a spring plate 26. It is clear that the forms of both plate 9 and of plate 26 may correspond to the plate forms described above and shown in the preceding figures The mounting of the plates 9 and 26 respectively can take place in the same way as in the various other embodiments.
FIG. 10 shows an embodiment in which percussion body 6 is guided in an axial blind drilled hole 50 in the tool spindle. The end of percussion body 6 projecting outside the drilled hole 50 displays notch 20, into which tongue 21 of spring plate 9 projects. The spring plate is turned over at a central portion 21 to form sleeve 51 in which groove 52 is arranged. In groove 52 a ball cage 53 can be accommodated which similarly runs in a sloping ball track 54 of the drive body 8. The drive body 8 is mounted directly onto the shaft 3 coming from the motor 2 by means of two radial ball bearings 55 separated by a mutual distance.
FIGS. 11 and 12 show a following embodiment in which the rotating drive of a tool can be inactivated while the percussion mechanism remains in operation. To that end tool spindle 5 is provided with a portion 60 with external splines, upon which is arranged a slidable ring with internal splines 61. In this way ring 61 is slidable in an axial direction with respect to spindle 5, but remains non-rotatable in respect thereof. On the side facing gear wheel 18 ring 61 is provided with dowels 62, which can engage with recesses in the side face of gear wheel 18. When the dowels 62 fall into these recesses, gear wheel 18 is non-rotatable with respect to ring 61. A compression spring is held between a wall member 63 of the housing 1 and ring 61.
In this embodiment an indication is also made of how the tool, for example a drill-bit G, should preferably be held. This may be with the known drill receiving device, which is screwed onto a screw thread of tool spindle 5. This holder device consists of a central part 70, around which a threaded part 71 is mounted. At the front of central part 70 and inside threaded part 71, wedge shaped jaws 72 are placed, whereof the inward facing parts 73 fall into recesses in the shank of the drill-bit G. The length of the parts 73 is less than the length of the recess in the drill-bit G, so that the drill-bit can undergo a certain axial movement with respect to the receiving apparatus, while nonetheless a rotary motion can be transmitted. In this way it is possible to mount the end face of the drill shank G directly against the end face of too spindles, so that the percussive energy is delivered from the percussion body 6 via tool spindle 5 directly to the drill-bit G.
An alternative embodiment of the holder head is shown in FIG. 13, in which the portion of tool spindle 15 protruding form housing 1 is executed with regularly around the circumference hollowed out parts 75, into which roller bodies 76 fit. These lie enclosed (in both the axial and in the radial sense) in the recesses 75. Tool spindle end 5 also carries a sleeve-like housing 76' with recesses 77 similarly for the receiving of the roller bodies 76. The length of sleeve-like housing 76' is such that this can accommodate the shank end of the drill-bit G. This shank end is also made with recesses 78 for the accepting of roller bodies 79. The length of recess 78 is however here greater than that of the bodies 79, so that an axial movement of the shank G with respect to roller bodies 79 is possible, but not a radial movement. The roller bodies 79 fit analogously to the bodies 75 into chambers 80 of sleeve 76'. The bodies 75 and 79 respectively are held in their places by the appropriate rings 81 and 82 respectively which are mounted slidably on the outside of the sleeve 76'. Between the rings there is mounted a compression spring 83, which on the one hand ensures that ring 81 rests against a shoulder 84 of sleeve 76' and on the other hand ensures that ring 82 rests against the end face of a collar 85 mounted firmly on sleeve 76'. The collar 85 is, for instance, made of plastic material. For the fastening of the collar 85 on the sleeve 76', the latter is provided with a groove-shaped recess 86 in which a thickened edge 87 of the collar locks grippingly. The sleeve 76' with the members supported thereby, can be removed from the end of tool spindle 5 by sliding ring 81 to the left in opposition to the pressure of the compression spring 83, whence the roller bodies 76 can be moved out of the recesses 75, whereafter sleeve 76' can be removed. The refitting takes place in reverse manner.
For the purposes of protection, ring 82 may also be provided with a skirt part 88 extending over the compression spring 83 and partly over ring 81.
FIG. 14 give a divergent configuration, in which on the underside of the housing 1 there is placed an intake opening 97. Owing to this opening 97, it is possible to carry the air stream via the percussion mechanism and passage opening 92, directly to motor 2 and to discharge the air stream through an outlet opening 95. In this embodiment passage opening 94 is absent.
The opening 97 is excellently suited for the attachment of a flexible tube, as is shown in FIG. 15. This flexible tube 98 is connected to a handgrip 100 which is fastened in the usual way by means of a mounting ring to the housing 1. The handgrip 100 is made hollow and comprises a dust bag 101, which is arranged freely inside the handgrip. The dust bag extends from bottom to top and is firmly mounted on the central intake opening 102 inside the handgrip, which stands in connection with a second flexible tube 103. This flexible tube leads to a drill foot 104, which may be joined in known fashion with the handgrip through rod 105. Dust produced by drilling can be led through the hollow drill foot 104 and the tube 103 into the dust bag 101, the air stream being engendered by the fan 90 of the electric motor.
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1989ASAssignmentOwner name: EMERSON ELECTRIC CO., NETHERLANDSFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:HOUBEN, J.P.;MOOLENAAR, A.J.;REEL/FRAME:005135/0857Effective date: 19890712Feb 25, 1993ASAssignmentOwner name: S-B POWER TOOL COMPANY, ILLINOISFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EMERSON ELECTRIC COMPANY;REEL/FRAME:006443/0996Effective date: 19921015Nov 23, 1993RFReissue application filedEffective date: 19930929Nov 28, 1994FPAYFee paymentYear of fee payment: 4Aug 8, 1995RFReissue application filedEffective date: 19950605Apr 16, 2003REMIMaintenance fee reminder mailedOct 1, 2003LAPSLapse for failure to pay maintenance feesNov 25, 2003FPExpired due to failure to pay maintenance feeEffective date: 20031001RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services