US3011480A - Impact tool - Google Patents

Impact tool Download PDF

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Publication number
US3011480A
US3011480A US27374A US2737460A US3011480A US 3011480 A US3011480 A US 3011480A US 27374 A US27374 A US 27374A US 2737460 A US2737460 A US 2737460A US 3011480 A US3011480 A US 3011480A
Authority
US
United States
Prior art keywords
valve
latch
motor
spindle
spring
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
US27374A
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English (en)
Inventor
John B Vilmerding
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.)
Ingersoll Rand Co
Original Assignee
Ingersoll Rand Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ingersoll Rand Co filed Critical Ingersoll Rand Co
Priority to US27374A priority Critical patent/US3011480A/en
Priority to GB12889/61A priority patent/GB938601A/en
Priority to BE603118A priority patent/BE603118A/fr
Priority to SE4587/61A priority patent/SE307546B/xx
Application granted granted Critical
Publication of US3011480A publication Critical patent/US3011480A/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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/904—Tool drive turbine, e.g. dental drill

Definitions

  • lt is an object of this invention to provide such an automatic shut-off.
  • FIGURE 1 a longitudinal view of the hand tool, in this instance a wrench, front portions of the casing and interior being shown in longitudinal section, other parts being shown in dashed lines to indicate the general arrangement of the motor and its control features,
  • FlG..2 is a longitudinal view partly in section showing the details of the control mechanism
  • FIG. 3 is a cross section of the tool taken along the line 3-3 looking in the direction of the arrows, and
  • FIG. 4 is a longitudinal section along the line 4 4 of FlG. 3 looking in the direction of the arrows.
  • the line 2-2 and the arrows thereof indicate the longitudinal section along which FIG. 2 is taken and indicated in FlG. 3.
  • the invention is shown applied to a type of tool commonly known as an impact wrench, the reason for this being that these tools are much lighter for any driven degree of torque to be developed, althoughit will be understood that the invention is applicable to wrenches whether electric driven, automatic, or otherwise, there 4being in all cases a motor here shown as a pneumatic motor whose object is to drive a suitable spindle 12 adapted to be tted with the work engaging implement, in this case it being a socket 14 for engagement with the nut 16.
  • a motor here shown as a pneumatic motor whose object is to drive a suitable spindle 12 adapted to be tted with the work engaging implement, in this case it being a socket 14 for engagement with the nut 16.
  • spindle 12 is the anvil of an impact wrench which may be of the character shown .in limerson et al., latent No. 2,160,150 of May 30, 1939 in which the motor driven hammer 18 drives the spindle 12 by impact intermittently partly under the influence of a spring 20.
  • the tool is provided with a casing indicated at 22 at the rear of which is provided a .suitable grip or andle 24 and as is usual in such a tool, air is supplied at an aperture 26 (FIG. 2) in the handle to receive a suitable coupling 23 leading to a source ofcompressed air (not shown), a throttle valve 30 in this instance controlled by a trigger 32 cooper-ating with an actuating plunger 34.
  • valve chamber member 38 means to control the flow of energy to the motor which in this instance is a valve 40 positioned in a chamber having two portions 42 and 44.
  • the chamber portion 42 is the terminus of the supply port 36 and the chamber portion 44 communicates with a port 46 leading to motor 10.
  • ka valve seat 48 for the valve 40 which is adapted to control the flow of air to the motor.
  • Valve 40 is axially movable on and off its seat 48 and to this end is provided with a cylindrical guiding portion 50 slidable in a bushing 52 mounted in the valve chamber member 38.
  • the valve 40 is necked down as at 54 between the guiding portion 50 and a head 56.
  • a renewable washer 58 backed by washer 60 held in place by a suitable cap screw 62.
  • the valve 40 is biased to its open position by a spring 64 encircling the valve and bearing at one end against the l'bushing 52, at its other end against a ring 66 encircling.
  • valve 40 and in turn bearing against a sleeve 68 interposed between the washer 58 and the ring 66.
  • Means which is actuatable by the turning of the spindle 12 to Control the operation of valve 40 and thereby to shut ofi the supply of energizing compressed air to the motor 10.
  • a latch member 72 extending into the slot 70 ⁇ and movable axially therein and rotatably in a sleeve bearing 74 mounted in the slot 7 0.
  • actuation of the valve 40 should be controlled by the latch 72 which in turn is actuatable by a member or means under the control of the spindle 12, that is to say upon a predetermined degree of rotation ofthe spindle 12, the latch 72 should release the valve 40 thereby automatically controlling operation of the motor 10.
  • a rod 78 fixedly attached to the spindle 12 as by a key 80.
  • Rod ⁇ '78 extends lengthwise over the tool and preferably axially and through the valve chamber member 38.
  • valve chamber member 3S ⁇ is provided with a .cavity 81 across which latch member 72 extends to a bearing 82 mounted in an outer wall of said member 38.
  • Rotatably mounted on rod 78 (FIG. 2) is a rotatable member 84 having teeth S6 forv engagement with a dog 88 mounted on the rod like shank of the latch 72.V
  • the shank of the latch is hexagonal as shown at ,90 so the interior of the dog 88 is likewise hexagonal so that the dog may slide on shank part 90 for purposes more apparent hereinafter.
  • Dog 88 is provided with a tooth 92 to engage one or another of the teeth 86.
  • YLatch member 72 being both rotatably and axially movable in its bearings 74 and 82 is biased against both such movements.
  • latch member 72 is normally held in its position in which the tooth 92 engages teeth 86 of the rotatable member 84.
  • the valve 40 is urged by air pressure in chamber portions 42 and 44 toward its closed position.
  • a plunger 98 is adapted to rota-te latch 72 so that tooth 92 will disengage teeth 86 on rotatable member 84.
  • Plunger 98 is adapted to reciprocate in the bore 100 in the direction transverse to latch 72 and in line with arm 76.
  • Plunger 98 is provided with a head 102 of slightly larger diameter than the bore 100 and tits into a bore 104 which contains also a coil spring 106 held in place by a screw plug 10S.
  • a stop member 116 which fixes the initial position of rotatable member 84 with respect to shaft 73.
  • a spring 11S one end of which engages a collar 120 non-rotatably mounted on rod 7S and the other end tted into a hole 122 in the ratchet member 84.
  • Spring 118 being of the torsion variety wili bring the pin 110 into abutment with the stop member 116 whenever ratchet member 34 is disengaged.
  • the degree of rotation of rod 7S before engagement of pins 110 and 112 with each other will depend upon the initial position of pin 112 with respect to pin 110. Provision is made for adjustment of such position and for this purpose the end of the rod 7S is formed hexagonally as at 124 and the disc 114 carrying the pin 112 is removable from the end of the rod 7S endwise and replaceable in a variety of positions of the pin 112. Disc 114, in this instance, is heid on the rod 78 by a thumb screw 126 which will also hold in place an index 12S indieating the position in which pin 112 lies with respect to pin 110'.
  • the motor is of the Well known vane type, and if desired, may be reversible.
  • a suitable reversing valve 13%) may be provided which is adapted to cooperate with the motor ports 132 and 134 in one of its rotated positions bein-g adapted to alternatively connect those ports with a suitable exhaust port 136 and the supply passage 138 through the valve body in connecting with the motor supply passage 46.
  • valve 135 In the reversed position of valve 135, the latch mechanism would cease to function in its usual manner although no harmful elects would probably occur since teeth 92 and 86, because of their angularity at their back faces, would slide over one another without damage. Still no beneficial effect could be imagined under such circumstances.
  • the valve 40 is provided with a tail portion 140 extending across slot 7G into a bushed bore 142.
  • Bushing 144 in the bore 142 is provided with a transverse aperture 146 adapted to register in shut-o position with a notch 148 in the tail 140.
  • a hand operated plunger is slidable in a bore 152 in the valve chamber member 38 and has a knob 154 for thumb contact.
  • An enlarged -bore 156 houses a ilange 158 on the plunger 150 to enable coil spring 160 to press plunger 150 in its outermost position.
  • the bore 152 is transverse to the axis of the valve 40 and so positioned that the inner end of plunger 15) is adapted to enter the aperture 146 in bushing 144 for engagement with the notch 148 in the tail 140 of the valve 40. In such engaging position the valve 40 is inoperative and consequently the latch 72 is likewise inoperative.
  • valve 4d moves forward to push against arm 76 of latch 72 to bring tooth 92 of latch 72 into engagement with one or another of ratchet teeth S6. It the tooth 92 does not meet the other teeth squarely, it will slide along the hexagonal part or latch member 72 until it is able to seat properly.
  • Throttle valve closing will occur when the operator releases pressure on the trigger 32.
  • the ⁇ supply of air to chamber portion 42 is cut of, that which -remains will leak out through bleeder port 166 into the chamber portion 44 and thence to the motor Where it is -able to escape since such motors are always leaky.
  • spring 64 is now in condition to return valve 40 to its original open position.
  • An automatic shut-oh for power Wrenches and the like having a motor and a spindle to be turned by the motor and adapted to be fitted with a work engaging implement to engage and turn a work piece relative to another work piece including means to control the flow of ⁇ energy to the motor, and means actuatable upon a predetermined degree of rotation of said spindle relative to said another work piece to operate said control means to shut off the supply of energy to said motor.
  • An automatic shut-off for power wrenches and the like having a motor and a spindle to be turned by the motor adapted to be fitted with a work engaging imple- 6 relative rotation thereof to cause said member to actuate said latch.
  • An automatic shut-olf for power wrenches and the like having a pneumatic motor, a throttle valve, and a spindle to be turned by the motor and adapted to be litted with a work engaging implement
  • a control valve associated with said throttle valve to shut off the supply of air to the motor means to bias the control valve to normally open position, said valve having a pressure face to overcome said biasing means while said throttle valve is open, a latch to engage said control valve to oppose pressure on said pressure face and having a Vdog, a shaft rotatable with said spindle, a toothed member rotatable on said shaft engageable with the dog of said latch and adapted to move said latch to a position to disengage said valve, a trip member rotatable with said shaft, means biasing said toothed member and trip ment to engage and turn a work piece relative to another e work piece, including means to control the ilow of energy to the motor, and means actuatable upon a predetermined degree of rotation of said spindle relative to said
  • An automatic shut-off for power wrenches andthe like having a pneumatic motor and a spindle to be'turned by the motor and adapted to be itted with a work engaging implement including a valve for controlling the ow of motive air to the motor, a member actuatable by the spindle in accordance with the turning of the spindle, a latch for holding said valve in open position, and means controlled by said member to release said latch.
  • An automatic shut-olic for power wrenches and the like having a pneumatic motor and a spindle to be turned by the motor and adapted to be iitted with a work engaging implement
  • a valvev for admitting air to said motor, means for biasing said valve to its open position, a member actuatable by the spindle in accordance with the turning of the spindle, a latch for holding said valve in open position, means controlled by said member to release said latch, and means to overcome said biasing means to close said valve.
  • An automatic shut-olf for power wrenches and the like having a pneumatic motor and a spindle to be turned by the motor and adapted to be tted with ⁇ a work engaging implement to engage and turn a work piece relative to another work piece including a valve for admitting air to said motor and normally biased to its opent' member to a predetermined angular relation to each other, and projections on said toothed member and said trip member mutually engageable to cause latch releasing rotation of said toothed member.
  • An automatic shut-off for power wrenches and the like having a pneumatic motor,'a throttle valve, and a spindle to be turned by the motor and adapted to be fitted with a work engaging implement as set forth in claim 7 in which means is provided to adjust said predetermined angular relation.
  • An automatic shut-off for power Wrenches and the like having a pneumatic motor, a throttle valve, and a spindle to be turned by the motor and adapted to be fitted with a work engaging implement as set forth in claim 7 in which said latch is rotatable into dog engaging relation with said toothed member and is provided with an arm engageable by said control valve to maintain vsuch relation, said latch being axially slidable to disenposition, a latch for holding said valve in open position,
  • An automatic shut-off for power wrenches and the like having a pneumatic motor, a throttle valve, and a spindle to be turned by themotor and adapted to be tted cludes means to hold said latch againstactuation with respect to said valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US27374A 1960-05-06 1960-05-06 Impact tool Expired - Lifetime US3011480A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US27374A US3011480A (en) 1960-05-06 1960-05-06 Impact tool
GB12889/61A GB938601A (en) 1960-05-06 1961-04-10 Improvements in impact wrenches and the like
BE603118A BE603118A (fr) 1960-05-06 1961-04-27 Dispositif d'arrêt automatique pour clefs de serrage automatique et analogues
SE4587/61A SE307546B (en)) 1960-05-06 1961-05-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27374A US3011480A (en) 1960-05-06 1960-05-06 Impact tool

Publications (1)

Publication Number Publication Date
US3011480A true US3011480A (en) 1961-12-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US27374A Expired - Lifetime US3011480A (en) 1960-05-06 1960-05-06 Impact tool

Country Status (4)

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US (1) US3011480A (en))
BE (1) BE603118A (en))
GB (1) GB938601A (en))
SE (1) SE307546B (en))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924961A (en) * 1973-12-15 1975-12-09 Bosch Gmbh Robert Pneumatic torqueing tool
US4083270A (en) * 1977-03-18 1978-04-11 Desoutter, Inc. Air motor having angular displacement control means
US4495940A (en) * 1982-06-09 1985-01-29 Hiroshi Takaishi Massager
US5526722A (en) * 1995-03-17 1996-06-18 Limehouse; William L. Impact tool for removing bolts
US6006525A (en) * 1997-06-20 1999-12-28 Tyree, Jr.; Lewis Very low NPSH cryogenic pump and mobile LNG station

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE537702A (en)) *
US2137462A (en) * 1935-11-29 1938-11-22 Cincinnati Milling Machine Co Index head
US2246910A (en) * 1940-07-30 1941-06-24 Chicago Pneumatic Tool Co Overbalanced governor
US2422733A (en) * 1945-04-02 1947-06-24 Ingersoll Rand Co Speed responsive fluid motor throttling and shutoff valve means
US2569244A (en) * 1945-04-20 1951-09-25 Independent Pneumatic Tool Co Portable power-driven tool
US2814277A (en) * 1955-12-27 1957-11-26 Ingersoll Rand Co Shut-down mechanism for pneumatic tools

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE537702A (en)) *
US2137462A (en) * 1935-11-29 1938-11-22 Cincinnati Milling Machine Co Index head
US2246910A (en) * 1940-07-30 1941-06-24 Chicago Pneumatic Tool Co Overbalanced governor
US2422733A (en) * 1945-04-02 1947-06-24 Ingersoll Rand Co Speed responsive fluid motor throttling and shutoff valve means
US2569244A (en) * 1945-04-20 1951-09-25 Independent Pneumatic Tool Co Portable power-driven tool
US2814277A (en) * 1955-12-27 1957-11-26 Ingersoll Rand Co Shut-down mechanism for pneumatic tools

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924961A (en) * 1973-12-15 1975-12-09 Bosch Gmbh Robert Pneumatic torqueing tool
US4083270A (en) * 1977-03-18 1978-04-11 Desoutter, Inc. Air motor having angular displacement control means
US4495940A (en) * 1982-06-09 1985-01-29 Hiroshi Takaishi Massager
US5526722A (en) * 1995-03-17 1996-06-18 Limehouse; William L. Impact tool for removing bolts
US6006525A (en) * 1997-06-20 1999-12-28 Tyree, Jr.; Lewis Very low NPSH cryogenic pump and mobile LNG station

Also Published As

Publication number Publication date
GB938601A (en) 1963-10-02
SE307546B (en)) 1969-01-07
BE603118A (fr) 1961-08-16

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