# US 5,704,744 A · Arrangement for transmitting torque in a manually operated tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,744 A - Document ID: US5704744A - Status: Granted - Kind: A - Application number: 08/643,813 - Filed: 1996-05-06 - Granted: 1998-01-06 - Earliest claimed: 1995-05-04 - Assignees: Hilti Aktiengeschaft - Inventors: Werner Kleine; Josef Obermeier - Web page: https://patentgrep.com/patent/US5704744A ## CPC - B25B 23/0042: {Connection means between screwdriver handle and screwdriver shaft} - B25B 23/0035: {Connection means between socket or screwdriver bit and tool} - B25D 17/088: {with radial movable locking elements co-operating with bit shafts specially adapted therefor} - B25D 2217/0034: Details of shank profiles - B25D 2217/0042: Ball-shaped locking members - B25D 2250/301: Torque transmission means - Y10T 279/17094: Sleeve type retainer - Y10T 408/907: including detailed shank - Y10T 408/95: with tool-retaining means - Y10T 408/953: Clamping jaws - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING - B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An arrangement for transmitting torque from a chuck (5) in a manually operated tool to a tool bit (1) having an axially extending chuck section (2) insertible into the chuck. The chuck section (2) has axially extending entrainment faces (31) arranged to cooperate with correspondingly shaped torque transmitting faces (6) in the chuck (5). The chuck section (2) is arranged to cooperate with a device (7) in the chuck for retaining the tool bit and affording limited axial displaceability of the bit. The chuck section (2) is formed with at least one recess (4). The device (7) in the chuck includes a locking element (8) engageable in the recess. The locking element (8) is axially and radially displaceable both to a limited extent and the axial displaceability of the tool bit is possible at least in part, by the limited axial displaceability of the locking element (8). ## Claims ### Claim 1 Arrangement for torque transmission in manually operable tools with a tool bit (1) insertable into a tool bit chuck (5), said tool bit comprises an axially extending chuck section (2) insertable into said chuck, said chuck section (2) having axially extending entrainment faces (31) arranged to cooperate with axially extending torque transmission faces (6) in said chuck (5), first means in said chuck section (2) cooperating with second means (7) in said chuck (5) for affording retention of the said tool bit (1) within said chuck and for providing limited axial displacement of said tool bit, said first means (4) comprises at least one recess in said chuck section (2), said second means (7) comprises a locking element (8) arranged to cooperate with said recess (4) and said locking element (8) being axially and radially displaceable both to a limited extent and the limited axial displaceability of said tool bit (1) being afforded at least partially by the limited axial displaceability of said locking element (8) and said recess (4) in said chuck section (2) has an axial extent substantially equal to the axial extent of said locking element (8). ### Claim 2 (depends on 1) Arrangement, as set forth in claim 1 wherein said chuck section has a forward region (17) spaced from an insertion end (16) of said chuck section inserted first into a mouth region of said tool chuck (1), and said recess (4) located in the said forward region (17). ### Claim 3 (depends on 2) Arrangement, as set forth in claim 2, wherein at least two recesses (4) being located in said chuck section (2) and said recesses being approximately hemispherically-shaped and equidistantly spaced from one another around a circumference of said chuck section (2) of said tool bit (1). ### Claim 4 (depends on 2) Arrangement, as set forth in claim 2, wherein one said recess (4) is provided for each said entrainment face (31). ### Claim 5 (depends on 2) Arrangement, as set forth in claim 2, wherein said recesses (4) are arranged around the circumference of said chuck section (2) for forming a circumferentially extending annular groove (4). ### Claim 6 (depends on 5) Arrangement, as set forth in claim 5, wherein said axially extending entrainment faces (31) in said chuck section (2) being located in ledges (3) and extending substantially perpendicularly to the circumference of said chuck section (2) in which the recesses (4) forming said annular groove (4) are arranged. ### Claim 7 (depends on 6) Arrangement, as set forth in claim 6, wherein said locking element has a locking surface being matched to a cross section of said annular groove in the region of the locking surface and being located with the locking surface between at least two said ledges. ### Claim 8 (depends on 7) Arrangement, as set forth in claim 7, wherein said ledges (3) having said entrainment faces (31) inclined relative to a radial plane of said ledges at an angle (.alpha.) in the range of approximately 15.degree. to 60.degree.. ### Claim 9 (depends on 8) Arrangement, as set forth in claim 8, wherein said ledges (3) comprise second flanks (32) spaced circumferentially from said entrainment faces (31) and inclined relative to the radial plane (R) of the ledges at an angle (.beta.) larger than the angle (.alpha.) of said entrainment faces (31). ### Claim 10 (depends on 6) Arrangement, as set forth in claim 6, wherein said ledges (3) arranged on said chuck section (2) having a sinusoidally shaped outside contour. ### Claim 11 (depends on 10) Arrangement, as set forth in claim 10, wherein said chuck section (2) having an uneven number of said entrainment faces (31) and of said correspondingly arranged matching faces (6) in said tool bit chuck (5), wherein the number of said entrainment faces and matching faces being five for chuck section diameter up to 10 mm. ### Claim 12 (depends on 10) Arrangement, as set forth in claim 10, wherein said chuck section (2) having an uneven number of said entrainment faces (31) and of said correspondingly arranged matching faces (6) in said tool bit chuck (5), wherein the number of said entrainment faces and matching faces being seven for chuck section diameter in the range of 10 mm to 15 mm. ### Claim 13 (depends on 10) Arrangement, as set forth in claim 10, wherein said chuck section (2) having an uneven number of said entrainment faces (31) and of said correspondingly arranged matching faces (6) in said tool bit chuck (5), wherein the number of said entrainment faces and matching faces being up to eleven for chuck section diameter greater than 15 mm.