US3687179A - Electrically operated screw driver - Google Patents

Electrically operated screw driver Download PDF

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Publication number
US3687179A
US3687179A US14034A US3687179DA US3687179A US 3687179 A US3687179 A US 3687179A US 14034 A US14034 A US 14034A US 3687179D A US3687179D A US 3687179DA US 3687179 A US3687179 A US 3687179A
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US
United States
Prior art keywords
screw
driver
shank
electrically operated
tool handle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US14034A
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English (en)
Inventor
Katsuyuki Totsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
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Publication of US3687179A publication Critical patent/US3687179A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
    • B25B23/105—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit
    • B25B23/106—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit the driving bit being a blade
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means

Definitions

  • ABSTRACT This specification discloses an electrically operated screw driver comprising in combination, a tool handle accommodating a compact electric motor therein, a driver shank connected to the electric motor and a clutch mechanism arranged therebetween for transmission of the manual driving power from the tool handle to the driver shank by which a substantial part of the screw fastening operation is carried out automatically by an electric power and an ultimate tightening operation is ensured manually with the same screw driver while confirming the degree of tightness.
  • FIGJO BACKGROUND OF THE INVENTION The present invention is concerned with an electrically operated screw driver comprising in combination a tool handle accommodating a compact electric motor therein, a driver shank and a clutch mechanism arranged therebetween for transmission of the manual driving power from the tool handle to the driver shank.
  • the driving operation of the screw into the objective threaded hole by means of the screw driver is comprised of the following two steps:
  • the first fastening step or the substantial part of the screw fastening is conducted under the light resistance with a relatively extended screwing motion.
  • the ultimate tightening of the screw is conducted under the increasing resistance with the negligible turning motion but with a great driving power.
  • the initial standing operation of the screw especially, machine screws in the threaded hole and, more particularly, the threaded hole located in the retired position is usually cumbersome for the operator, and the greater part of the screw fastening operation is consumed for this initial screw standing operatron.
  • the general object of the invention is to provide an electrically operated screw driver which effectuates a substantial part of the screw fastening automatically by the actuation of the electric power and ensures the ultimate tightening manually while confirming the degree of tightness under the quick driving motion.
  • the principal object of the invention is to provide an electrically operated screw driver comprising a tool handle accommodating a compact electric motor therein, a driver shank and a clutch mechanism arranged therebetween for transmission of the manual driving power from the tool handle to the driver shank in which an electrical driving power is transmitted from the electric motor to the driver shank directly whereas the manual driving power is transmitted from the tool handle through the clutch mechanism to the driver shank.
  • Another object of the invention is to provide an electrically operated screw driver comprising a tool handle accommodating a compact electric motor therein, a driver shank, a clutch mechanism arranged therebetween for transmission of the manual driving power from the tool handle to the driver shank, and a releasing mechanism mounted around the driver shaft in abutment with the clutch mechanism for idling the tool handle when the tightness of the screw gets over a certain limit, in which the electrical driving power is transmitted from the electric motor to the driver shank directly whereas the manual driving power is transmitted from the tool handle through the clutch mechanism and the release mechanism to the driver shaft.
  • a further object of the invention is to provide an electrically operated screw driver which comprises a tool handle accommodating a compact electric motor therein, a driver shank which is provided with a screw holding means and a clutch mechanism arranged therebetween for transmission of the manual driving power from the tool handle to the driver shank.
  • a further object of the invention is to provide an electrically operated screw driver which comprises a tool handle accommodating a compact electric motor therein, a driver shank which is provided with a screw holding means, a clutch mechanism for transmission of the manual driving power from the tool handle to the driver shank and a releasing mechanism mounted around the driver shaft in abutment with the clutch mechanism for idling the tool handle when the tightness of the screw gets over a certain limit
  • Still a further object of the invention is to provide a combination of aforementioned electrically operated screw driver with a screw which at its head portion is provided with a screw slot with a central hole of greater diameter and depth than the width and depth of the slot.
  • FIG. 1 is a front elevation of the electrically operated screw driver according to the invention
  • FIG. 2 is a fragmentarily and longitudinally sectioned view ofFIG. 1;
  • FIG. 3 is a pictorial view depicting the state in tightening operation of the screw driver of FIG. 1;
  • FIG. 4 is a front elevation of the electrically operated screw driver of another embodiment according to the invention.
  • FIG. 5 is a fragmentarily and longitudinally sectioned view of FIG. 4;
  • FIGS. 60 to c are pictorial views of the release mechanism before assembly
  • FIGS. 70 and b are pictorial views of the release mechanism before assembly of another embodiment
  • FIG. 8 is a perspective view, fragmentarily enlarged, of the screw holding means according to the invention.
  • FIG. 9 is a perspective view, partially recessed, of the screw suitable for the screw driver of the invention.
  • FIG. 10 is a pictorial view illustrating the screw holding means suspending the screw.
  • FIG. I 1 is a plan view of the screw the line AA of FIG. 10.
  • FIGS. I and 2 there is illustrated therein in front and longitudinally sectioned views a tool handle of the screwdriver 10 which is comprised of an outer sleeve 12 and a flanged cover 14 secured thereto in which a compact electric motor 16 is accommodated.
  • a driven shaft 18 extending from the electric motor 16 is connected to an intermediate shaft 20 which is in turn coupled releasably at its other end with a driver shank 22.
  • the intermediate shaft 20 at its lower end is provided with an insertion bore 24 and a diametric recess 26.
  • the driver shank 22 at its upper end portion is provided with a diametric slot 28 and two symmetrically and outwardly extending projections 30 adapted to fit into the diametric recess 26 for transmitting the rotation of the intermediate shaft 20 to the driver shank 22.
  • the slotted end of the driver shank is forced into the insertion bore 24 of the intermediate shaft 20 so that the driver shank 22 is rigidly associated with the intermediate shaft 20 under the resilient influence of the legs on either side of the slot 28.
  • intermediate shaft 20 and the driver shank 22 may be formed integrally as a single driver shank without providing complicated coupling construction.
  • the flanged cover 14 is provided with an extended constriction 32 and a ring 34 of the same outer diameter as the extended constriction 32 is mounted around the outer circumference of the intermediate shaft 20 in abutment with the said extended constriction 32 by a suitable fastener.
  • a grip coil 36 for ensuring the transmission of one way rotation of the tool handle it) to the driver shank 22.
  • a push button switch 38 mounted on the top end of the tool handle 10 is pushed downwardly by a finger of the operator to actuate the electric motor 16.
  • the rotation of the driven shaft 18 is transmitted through the intermediate shaft 20 to the driver shank 22 and thus the substantial part of the fastening operation of the screw is accomplished in an instant by the actuation of the electric motor.
  • the intermediate shaft 20 and the ring 34 affixed thereto turn in the counter direction to the spiral direction of the grip coil 36 so that a smooth rotation of both members is attained without being subjected to any frictional influence of the grip coil 36.
  • the tool handle 16 is intentionally turned by manual operation in a clockwise direction so that the manual driving power is transmitted from the extended constriction 32 of the flanged cover 14 through the grip coil 36 to the ring 34 for turning of the driver shank 22.
  • the turning direction of the extended constriction 32 is coincident with the spiral direction of the grip coil 36 mounted therearound and consequently by the turning of the extended constriction, the grip coil 36 is tightened firmly to transmit the turning motion to the ring 34 under the principle of the coil-grip friction clutch mechanism.
  • the ultimate tightening operation may be manually carried out in a positive way while confirming the degree of tightness by the finger feeling as seen in FIG. 3. It will be appreciated that the electrically operated screw driver according to the invention may also be driven without necessitating any electric power supply source.
  • a release mechanism for releasing the excessive tightness of the screw to be caused by the manual driving operation.
  • the ring 34 is free from the intermediate shaft 20 but is provided at its bottom face with a ridge 40 adapted to fit into a plurality of feed recesses 44 provided in a cam ring 42 having a keyway 46 into which a key or pin 48 is inserted through the intermediate shaft 20 to retain the cam ring 42 at the lower end of the intermediate shaft 20 as seen in FIGS. 4, 5 and 6.
  • a spring 50 for the resilient support of the cam ring 42 is carried by a nut 52 mounted vertically adjustably along the threaded end of the intermediate shaft 20 to provide an allowable limit of the tightness of the screw. That is, the co-acting effect of the ridge 40 with the recess M is increased with an elevation of the location of the nut 52 for compression of the spring 5t thereby enhancing the allowable limit of the tightness of the screw.
  • the ring 34 at its bottom face may be provided with a plurality of steel balls 54 in lieu of the ridge 40 as best shown in FIG. 7.
  • the electric driving power may be increased by providing a suitable reduction gear mechanism such as a planetary reduction gear between the driving shaft and the driven shaft.
  • a suitable reduction gear mechanism such as a planetary reduction gear between the driving shaft and the driven shaft.
  • the screw holding means comprises a shank end 56 provided with a diametric slot 58 and a center bore 60 of greater diameter and depth than the width and depth of the diametric slot 58, a replaceable driver bit 62 of rigid material having suitable size and thickness to fit into the diametric slot 58 and a resilient screw holding member 64 inserted into the center bore 60 so that a limited clearance is formed between the driving bit 62 and the screw holding member 64 so that the screw is resiliently retained by the screw holding means, as will be presently described.
  • the driver bit 62 at its edge portion is further provided with a center projection 66 adapted to facilitate the fitting of the driver bit 62 into the screw slot and the end of the screw holding member 64 is extended to coincide with the top end of the projection 66.
  • the screw holding means of the above construction is most suitable in driving a screw 68 having a screw slot 70 with a central hole 72 of greater diameter and depth than the width and depth of the slot 70 as best shown in FIG. 9.
  • the screw holding member 64 is in tight resilient contact with the wall of the center hole 72 of the screw while the opposite side of the bit 62 is thrust against the side wall of the screw slot 70 thereby ensuring holding of the screw for the subsequent driving operation without difficulty in standing the screw into the threaded hole.
  • the screw driving operation particularly the first fastening operation, is greatly facilitated.
  • the electrically operated screw driver according to the invention is operationally effective in driving the machine screws and the compact electric motor is sufiicient as a power supply source since the ultimate tightening operation is carried out manually.
  • said release mechanism comprises a clutch ring provided at its bottom end with projection means, said clutch ring being mounted around but free from said driver shank, a cam ring mounted around said shank adjacent said clutch ring, said cam ring being keyed to said shank for rotation therewith and limited vertical movement relative thereto, said cam ring being provided at its end adjacent said clutch ring with a plurality of recesses for mating engagement with said projection means, a spring mounted around said driver shank to support said cam ring, and a nut mounted vertically adjustably along the threaded end of said driver shank to firmly bear against said spring.
  • the electrically operated screw driver of claim 5 in combination with a screw which is provided with a screw slot and a central hole of greater diameter and depth than the width and depth of said slot.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US14034A 1969-08-06 1970-02-25 Electrically operated screw driver Expired - Lifetime US3687179A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6168769 1969-08-06

Publications (1)

Publication Number Publication Date
US3687179A true US3687179A (en) 1972-08-29

Family

ID=13178408

Family Applications (1)

Application Number Title Priority Date Filing Date
US14034A Expired - Lifetime US3687179A (en) 1969-08-06 1970-02-25 Electrically operated screw driver

Country Status (6)

Country Link
US (1) US3687179A (xx)
CH (1) CH504280A (xx)
DE (1) DE2011085C3 (xx)
FR (1) FR2056688A5 (xx)
GB (1) GB1297841A (xx)
NL (1) NL7005660A (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060114A (en) * 1974-07-03 1977-11-29 Ryuzo Matsushima Tightening device for threaded screw part
DE3322876A1 (de) * 1982-07-16 1984-01-26 Matsushita Electric Works, Ltd., Kadoma, Osaka Elektrisches handwerkzeug
US6102134A (en) * 1998-10-16 2000-08-15 Black & Decker Inc. Two-position screwdriver
US7137322B2 (en) * 1998-10-05 2006-11-21 Synthes (Usa) Screw holder
US20080092697A1 (en) * 2005-03-10 2008-04-24 Abdelgany Mahmoud F Screwdriver handle
US20150151414A1 (en) * 2013-11-30 2015-06-04 Hon Hai Precision Industry Co., Ltd. Hand-driven mechanical screwdriver
CN105563403A (zh) * 2016-02-24 2016-05-11 苏州携旅网络技术有限公司 一种按压式电控螺丝刀
US20180065233A1 (en) * 2016-09-06 2018-03-08 Ingersoll-Rand Company Spindle lock mechanism for pneumatic right-angle impact tool
US20190240815A1 (en) * 2018-02-05 2019-08-08 Honda Motor Co., Ltd. Finger tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2122161B2 (en) 2007-02-19 2024-01-17 Vestas Wind Systems A/S Wind turbine blade with strain sensing means, wind turbine, block sensor unit and uses hereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1169193A (en) * 1915-04-08 1916-01-25 Emile H Ramelli Automatic safety-clutch.
US2950746A (en) * 1957-08-12 1960-08-30 Gen Metals Corp Clutched handle for tool shanks
US2979089A (en) * 1958-04-24 1961-04-11 Hanns Fickert Portable battery-energized screw driver
GB905066A (en) * 1960-06-24 1962-09-05 Andre Arcelin Improvements in or relating to screws and screwdrivers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1169193A (en) * 1915-04-08 1916-01-25 Emile H Ramelli Automatic safety-clutch.
US2950746A (en) * 1957-08-12 1960-08-30 Gen Metals Corp Clutched handle for tool shanks
US2979089A (en) * 1958-04-24 1961-04-11 Hanns Fickert Portable battery-energized screw driver
GB905066A (en) * 1960-06-24 1962-09-05 Andre Arcelin Improvements in or relating to screws and screwdrivers

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060114A (en) * 1974-07-03 1977-11-29 Ryuzo Matsushima Tightening device for threaded screw part
DE3322876A1 (de) * 1982-07-16 1984-01-26 Matsushita Electric Works, Ltd., Kadoma, Osaka Elektrisches handwerkzeug
US4522270A (en) * 1982-07-16 1985-06-11 Matsushita Electric Works, Ltd. Hand-held electric tool
DE3322876C2 (de) 1982-07-16 1985-06-13 Matsushita Electric Works, Ltd., Kadoma, Osaka Elektrowerkzeug mit drehangetriebener Spindel
US7137322B2 (en) * 1998-10-05 2006-11-21 Synthes (Usa) Screw holder
US6321856B1 (en) 1998-10-16 2001-11-27 Black & Decker Inc. Two-position screwdriver
US6102134A (en) * 1998-10-16 2000-08-15 Black & Decker Inc. Two-position screwdriver
US20080092697A1 (en) * 2005-03-10 2008-04-24 Abdelgany Mahmoud F Screwdriver handle
US7966914B2 (en) * 2005-03-10 2011-06-28 Custom Spine, Inc. Screwdriver handle
US20150151414A1 (en) * 2013-11-30 2015-06-04 Hon Hai Precision Industry Co., Ltd. Hand-driven mechanical screwdriver
US9687971B2 (en) * 2013-11-30 2017-06-27 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Hand-driven mechanical screwdriver
CN105563403A (zh) * 2016-02-24 2016-05-11 苏州携旅网络技术有限公司 一种按压式电控螺丝刀
US20180065233A1 (en) * 2016-09-06 2018-03-08 Ingersoll-Rand Company Spindle lock mechanism for pneumatic right-angle impact tool
US10220493B2 (en) * 2016-09-06 2019-03-05 Ingersoll-Rand Company Spindle lock mechanism for pneumatic right-angle impact tool
US20190240815A1 (en) * 2018-02-05 2019-08-08 Honda Motor Co., Ltd. Finger tool

Also Published As

Publication number Publication date
DE2011085A1 (de) 1971-02-25
DE2011085B2 (de) 1973-06-07
GB1297841A (xx) 1972-11-29
NL7005660A (xx) 1971-02-09
DE2011085C3 (de) 1974-01-10
FR2056688A5 (xx) 1971-05-14
CH504280A (de) 1971-03-15

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