GB2188575A

GB2188575A - A power operated screwdriver

Info

Publication number: GB2188575A
Application number: GB08608232A
Authority: GB
Inventors: Roger Robert Saunders
Original assignee: Desoutter Ltd
Current assignee: Air Compressors and Tools Ltd
Priority date: 1986-04-04
Filing date: 1986-04-04
Publication date: 1987-10-07
Also published as: GB2188575B; EP0239698A2; DE3677372D1; GB8608232D0; EP0239698B1; ES2019876B3; ATE60535T1; EP0239698A3

Abstract

The screwdriver comprises a casing (10) accommodating a motor (11) and a bit holder (14) rotatable by the motor. A suction pick-up finder sleeve (15) is mounted at the front end of the casing for picking up and locating screws to be driven. A negative pressure is applied to the finder sleeve via a delivery path which is provided within the casing and which includes an annular gallery (14) preferably provided around a torque sensitive clutch (13) of the screwdriver. <IMAGE>

Description

GB 2 188 575 A 1 SPECIFICATION this pipe 18could be replaced byan

elongateduct defined between innerand outercasing parts.

A power operated screwdriver Because the gallery 19 is annular or at least su bsta ntia 1 ly a n n u la r the effective m ea n i ncrease i n This invention relates to a power operated 70 diameter of the f ro nt end of the casi ng 10 necessa ry screwdriver. to accommodate this gallery is small and It is known to provide power operated consequentlythe operator's view of the front end of screwdrivers with a vacuum connection to thefront the screwdriver is not obscured. Moreover, any of the tool for picking up screws. In one known type debristhat is sucked up bythe negative pressure is of power operated screwdriver the vacuum is 75 keptclear of those moving parts of the screwdriver connected to thefront of thetool using a flexible pipe which could becomejammed bysuch debris.

and a banjo connector on thefront of thetool. This The above embodiment is given bywayof hasthe disadvantage that the banjo connector and example only and many modifications are possible pipe obscuretheview of the operator. In another without departing from the scope of the invention.

known type of power screwdriver the vacuum is 80 For example, the invention could be applied to a stall connected to thefront of thetool through a clutch torque motorwhich would not have a torque chamber of thetool. Howeventhis hasthe sensitive clutch.

disadvantage that any debris that is sucked up bythe vacuum becomes jammed in the clutch mechanism. CLAIMS

According to the invention there is provided a 85 power operated screwdriver comprising a casing, a 1. A power operated screwdriver comprising a motor mounted in the casing, a screwdriver bit casing, a motor mounted in the casing, a screwdriver holder mounted in the casing for rotation by the bit holder mounted in the casing for rotation bythe motor, a suction pick-up finderat a front end of the motor, a suction pick-up finder at a front end of the casing adjacentto the bit holderfor picking up and 90 casing adjacentto the bit holderfor picking up and locating a screwto be driven, and meansfor locating a screwto be driven, and meansfor connecting a source of negative pressureto the connecting a source of negative pressuretothe finder, said means comprising an annularor finder, said means comprising an annularor substantially annular gallerywithin the casing and substantially annular gallery within the casing and extending rearwardlyfrom a position adjacentto the 95 extending rearwardlyfrom a position adjacenttothe frontend of thecasing. frontend of thecasing.

Preferred and/oroptional features of the invention 2. The screwdriver of claim 1, wherein the rear are setforth in claims 2-6. end of the gallery communicates with a pipe orduct The invention will now be more particularly which extendswithin the casing and which is described with referenceto the accompanying 100 connectableto a source of negative pressure ator drawing which is a schematic longitudinal section adjacentto the rear end of the casing.

through one embodiment of a power operated 3. The screwdriver of claim 1 or claim 2, wherein screwdriver according to the present invention. a torque sensitive clutch is interposed between the Referring nowto the drawing, the power operated motor and the bit holder and wherein the gallery is screwdriver shown therein comprises an elongate 105 provided around the clutch.

tubularcasing 10 accommodating in known manner 4. The screwdriver of anyone of the preceding a motor 11, which is preferably pneumatically claims, wherein the radial ly outer extent of the operated but which maybe electrically operated, a gallery is defined by an inner wall of the casing.

reduction gearbox 12, a torque sensitive clutch 13, 5. The screwdriver of anyone of the preceding and a bit holder 14 rotatable bythe motor 11 via the 110 claims, wherein the radial ly inner extent of the gearbox 12 and clutch 13, and supporting a gallery is defined by a stationary sleeve.

replaceable screwdriver bit 9. 6. The screwdriver of anyone of the preceding A suction pick-up finder sleeve 15 is mounted at claims, wherein a gearbox is interposed between the the front end of the casing 10 for locating a screw 16 motor and the bit holder.

picked up by a negative pressure applied to the 115 7. A power operated screwdriver substantially as findersleeve 15. hereinbefore described with referencetothe Negative pressure is communicated from a source accompanying drawing.

thereof, e.g. a vacuum pump (not shown), to a chamber 17 atthe front end of the casing 10, via a Amendments to the claims have been filed, and have pipe 18 and an annular gallery 19. The annular 120 thefollowing effect:- -

Claims

gallery 19 surroundsthe clutch 13 and is defined (a) Claims land 2 above

have been textually between the inner wall of the casing 10 and a sleeve amended.

20. The sleeve 20 is supported at itsfront end on a bush 21 in which the bit holder 14 is rotatably 1. A power operated screwdriver comprising a mounted and at its rear end in an adaptor 22, and 125 casing, a motor mounted in the casing, a screwdriver defines an outer casing of the clutch 13. The pipe 18 bit holder mounted in the casing for rotation bythe communicates with the gallery 19 and extends motor, a suction pick-up finder at a front end of the long itudi nal ly within the casing 10 from a position casing adjacentto the bit holderfor picking up and adjacentto the rear end of the gallery 19 to a position locating a screw to be driven, and means for adjacent to the rear end of the casing 10. However, 130 connecting a source of negative pressure to the 2 GB 2 188 575 A 2 finder, said means comprising an annularor substantially annular gallery within thecasing and extending rearwardlyfrom a position adjacenttothe frontend of the casing and a pipe orductwhich communicates with the rearend of thegalleryand which is connectable to a source of negative pressure at or adjacentto the rear end of the casing.
2. The screwdriver of claim 1, wherein the pipe or duct extends within the casing.

Printed for Her Majesty's Stationery Office by Croydon Printing Company (1) K) Ltd,8187, D8991685. Published byThe Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies maybe obtained.

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