US2818643A - Power actuated snips or shears - Google Patents

Power actuated snips or shears Download PDF

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Publication number
US2818643A
US2818643A US654605A US65460557A US2818643A US 2818643 A US2818643 A US 2818643A US 654605 A US654605 A US 654605A US 65460557 A US65460557 A US 65460557A US 2818643 A US2818643 A US 2818643A
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valve
cylinder
blade
position
piston
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US654605A
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Charles A Dawson
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Lockheed Corp
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Lockheed Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B15/00Hand-held shears with motor-driven blades
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D29/00Hand-held metal-shearing or metal-cutting devices
    • B23D29/005Hand-held metal-shearing or metal-cutting devices for cutting sheets

Description

C. A. DAWSON POWER ACTUATED SNIPS 0R SHEARS Jan. 7, 1958 Filed April 23, 1957 3 Sheets-Sheet 1 INVENToR. CHARLES A. DAwsoN Agen Jan. 7, 1958 C. A. DAWSON POWER ACTUATED SNIPS OR SHEARS 3 Sheets-Sheet 2 Filed April 25, 1957 INVENToR.

CHARLES A. DAWSON Agent Jan. 7, 1958 c. A. DAwsoN '2,818,643

POWER ACTUATED SNIPS OR SHEARS Filed April 25. 1957 3 Sheets-Sheet 5 TAT 44 42 43 IN VEN Agent CHARLES A. DA N nite States atent rownn AcrUArnn sNrrs on snnans Charles A. Dawson, Pacoima, Calif., assignor to Lockheed Aircraft Corporation, Los Angeles, Calif.

Application April 2.3, 1957, Serial No. 654,605

Claims. (Cl. Sli- 228) This invention relates to power actuated or boosted hand tools, and relates more particularly to fluid pressure boosted or iiuid pressure actuated shears or snips for cutting and trimming sheet metal and other sheet materials.

Hand shears are used extensively to cnt and trim sheet metal and in the final trimming operations the shears, as well as hand files, are resorted to to obtain the final accuracy. In the aircraft industry, and in other fields, thicker and harder sheet materials are being used to a greater extend and it is much more difficult to cut and trim such stock with hand shears or snips. It is especially diiiicult to follow a line with accuracy when cutting these thicker or harder sheets and much time and effort is expended in obtaining the required results.

It is an object of the present invention to provide simple, practical, hand shears incorporating effective power booster means adapting the shears for the expeditious cutting 'of sheet materials. The power booster means of the invention relieves the operator of exerting physical effort in the actual cutting of the stock, even thick, hard sheets, and therefore allows him to follow the cut or trim line with great accuracy.

Another object of the invention is to provide snips or shears of this kind that are used and manipulated in the same manner as conventional hand shears, being compact and relatively light in weight for easy control, direction and overall handling.

Another object of this invention is to provide snips or shears of this character wherein the power means or booster mechanism has an action closely and accurately following and conforming to the actual motion or action of the workmans hand so that the blades are operated and Icontrolled by the workman in the same fashion as the blades of typical hand shears.

Another object of the invention is t-o provide power actuated shears of this character incorporating a feel means offering a mild resistance to manual movement of the hand grip or handle so that the workman has a sense of feel of the cutting action, which means also serves to reduce or prevent over-travel of the shears. The feel means is a spring yieldingly urging both the thumb grip or handle and the control valve to their norma-l or idle positions so that when the physical force being exerted by the workman is relaxed or terminated the power operation and the cutting action are simultaneously terminated. This spring also operates to yieldingly hold the valve closed and the handle in its idle position when the tool is inactive.

A further object of this invention is to provide a power actuated or booster hand tool of this kind in which the valving, porting, etc. are within or carried by the actuating piston which in turn is connected with the movable blade of the shears to operate the same.

Other objectives and features of the invention will become apparent from the following detailed description of a typical preferred embodiment illustrated in the drawings in which:

Figure 1 is a side elevation of the shears of the invention with the cylinder, a portion of the cylinder piston and associated parts appearing in vertical cross section;

Figure 2 is a top or plan view `of the tool;

Figure 3 is a front elevation of the tool with portions of the hand grip and handle broken away;

Figure 4 is an enlarged fragmentary vertical sectional view taken substantially is indicated by line 4 4 on Figure 3; and

Figures 5 and 6 are enlarged fragmentary detailed sectional views taken substantially as indicated by lines 5 5 and 6-6 respectively on Figure 3.

The tool, as shown, includes a body 1G having a hand grip 11 on one end and a relative stationary blade 12 on its forward end. The major portion of the body 10 is in the nature of a cylinder having a fore and aft cylinder bore or opening 13. The grip 11 is adapted to receive the fingers of the workmans hand, as illustrated in Figure 1, and is centrally positioned in a vertical plane at the rear end of the body 10. The relatively stationary blade 12 is carried on an arm 14 projecting forwardly from the body 10. The arm 14 is attached to the underside of the body by bolts 15, or the like, and may if desired be integral with the blade 12. As shown in Figures l and 2, the blade 12 is spaced forwardly and slightly below the tool body to be conveniently engaged under the work W. It is preferred to provide the tool body 10 with one or more additional handles or grips to facilitate manual manipulation of the device. 1 have shown two horizontal sockets 16 projecting laterally from the body 1d adjacent its forward end and a hand bar 17 adapted to be removably screw-threaded in either socket, as desired. lt will be seen how the workman, by engaging one hand in the grip 11 and by grasping the bar 17, may conveniently support and direct the tool.

The snips or shears embody a second or relatively movable active blade 1S pivotally associated with the relatively stationary blade 12 by a hinge pin or screw 20. Th-e blades 12 and 18 are shaped and related to coact in the manner of conventional shear blades and may preferably be provided with hardened and ground active blade inserts or faces 21. The relatively movable blade 1S has a lever arm 22 projecting upwardly with respect to the hinge screw Ztl to have its upper end at or aligned with the central longitudinal axis of the cylinder opening 13. As shown in Figure l, the blade 12 may engage under the work W with the blade 18 above the work so that upon forward pivoting of the lever arm 22 the blades cooperate in cutting or shearing the work.

The power booster or power actuating means of the tool is operable to actuate or pivot the arm 22 of the relatively movable blade 18 under the precise control of the workman or operator. The power actuating means is fluid pressure actuated and is preferably a pneumatically operated cylinder and piste-n device comprising a piston 25 operable in the cylinder opening 13. The head of the piston 25 has an annular groove containing a seal ring 26 having sliding sealing engagement with the wall of the cylinder bore 13. The piston 25 is actuated or urged rearwardly by a spring 2'7 arranged in the cylinder under compression between the piston head and a cap or internal collar 2S threaded in the forward end of the cylinder opening. The piston 25 passes through the collar 28 with considerable clearance, as shown at 29, and in the preferred construction the seal ring 26 is an O ring or is otherwise shaped to have line Contact with the wall of the cylinder opening 13. This arrangement allows the piston 2S to nd its own center `and to have limited tilting or angular movement in the cylinder, the seal ring 26 forming a fulcrum for such movement. The forward lower portion of the piston 25 is notched or cut-away to leave a forwardly facing shoulder 31 engageable with the collar to limit forward travel of the piston and thus prevent excessive compression of the spring 27. An operative connection is provided between the forward end of the piston 25 and the arm 22 of the movable blade 18. ln practice, this connection may comprise a fork or yoke 32 having a stud 3? threaded in a central longitudinal bore 34 in the piston 25. The upper end of the blade arm 2.2 is received in the yoke 32 and is operatively connected with the yoke by a pivot pin 35. It will be seen how fore and aft movement of the piston 25 actuates and retracts the blade i3.

It is a feature that the porting and valvinfy for controlling operation of the piston 25 is carried in the piston itself. The air under pressure for actuating the tool may be supplied by a flexible line or hose 36 having an l. fitting 37 communicating with a port 3S in the forward end of the piston, see Figure 6. The port 3d extends tangentially to an axial port or passage 39 which, in turn, is joined by a transverse passage dit. The passage d@ leads to the above mentioned axial bore or opening 3d. This bere 34, which has its forward end closed by the stud 33 extends to the inner or rear end of the piston 2S to communicate with the cylinder i3. A valve 42 is provided in the passage 39 to control the flow of actuating Huid pressure through the port or passage system just described and to permit the exhausting of pressure from the cylinder 13 and thus allow return or retrograde movement of the piston 25 by the action of the spring 27. The valve 42 is arranged between and is cooperable with two spaced opposed valve seats d3 and 4d threaded or otherwise secured in the passage 39. The valve seat 4,3 faces forwardly or toward the forward end of the piston 25 and the valve 42 has a pointed or conical end cooperable therewith to close olf or prevent the flow of air under pressure through the passage system into the cylinder 13. The valve seat 54 faces rearwardly and has a central bore or opening d5 leading from the passage 40 to the atmosphere. The valve d2 is shaped to cooperate with the seat 4d to close off the passage 45 and thus prevent the discharge of air pressure from the cylinder 13 to the atmosphere. A stem 46 on the valve 42 extends forwardly through the passage d5 with considerable clearance to project from the forward end of the piston 25. As shown in Figures 4 and 5, the valve i2 is proportioned so that it leaves the passage 45 open when engaged on the seat 43. Conversely, when the valve 42 is urged against the seat by the action of the actuating air pressure, and thus closes the passage d5, the air under pressure may iiow through the passages 33, 39, di) and 34 into the cylinder lli. Furthermore, as seen in Figure 6, the valve l2 may assume an intermediate position where it is spaced clear of both seats S3 and 44.

The means for controlling or operating the valve 412 and thus controlling operation of the shear blade 19 includes a stem or rod 5d slidable longitudinally in a guide opening 5i in the upper portion of the tool body itl. A thumb grip 52 is provided on the rear end of the rod 50 t0 receive the thumb of the workman, as illustrated in Figure 1. An L. shaped arm or plate 53 is attached to the forward end of the slide rod 5G to be spaced in front of the projecting piston 25. The rear face of the plate S3 is engageable with the forward end of the valve stem 46. Spring means is provided to urge the plate 53 and rod 5t) rearwardly to actuate the valve 42 toward or against the seat 43 and to impart a sense of feel to the operators thumb engaged inthe grip 52. As shown in Figure 5, a spring 54.- is arranged under compression between the front of the plate 53 and a washer 55 which bears against the head of a screw or stud 56 on the piston 25. The stud 56 passes through an opening 57 in the plate 53 to lassist in guiding the plate and to prevent angular or rotary movement of the plate and slide rod Sil. The spring Sfiis sufciently strong to resist the action of the actuating air under pressure and hold the valve 42 closed against the seat d3 and to return the valve to this posi- H tion when the workmans forward pressure is removed from the grip 52. The workman of course may readily exert sufficient forward pressure on the grip 52 to move the rod Sti and plate forwardly against the action of the spring 542 to permit opening of the valve i2 and thus allow actuating air under pressure to iiow into the cylinder i3 to actuate the blade 18. Since the spring 5dat all times yieldingly resists forward movement of the grip 52 the workman senses the `action of the valve 42 and therefore the action of the shear blade i8.

It is believed that the operation of the tool will be readily understood from the foregoing detailed description. Assuming that air under pressure is supplied to the hose or line 36 and assuming that the blades l2 and 18 are in operative relation to the work W the operator or workman merely engages his lingers through the handle l?. and his thumb through the grip 52 and actuates the grip and rod 5t) forwardly to produce actuation of the shears. Upon such forward movement of the rod 5t) the air under pressure in the passage 39 opens the valve Li2 to an extent proportional to the forward advance of the rod 5l) and plate 53 and actuating air under pressure is admitted through the passages dil and 34 to the cylinder f3. This actuates or moves the piston 25 forwardly and causes the blade i8 to be actuated toward the relatively stationary blade 12 to cut the work W. It is to be particularly noted that the extent of actuation of the blade i8 is determined solely by the extent of movement of the grip 52. Thus if the grip 52 is advanced only a short distance the piston 25 is moved a proportionate distance by the above described action until the valve 42 assumes a position spaced between the seats 43 and 44 so that the actuating air under pressure escapes through the port 45 at the same rate as it enters through. seat 43. Under this condition the air pressure in the cylinder i3 merely balances the action of the spring 27 allowing the piston 25 and blade ld to remain stationary. Thus since the valve 42 and the porting and passage system are carried by the piston 2S itself there is a follow-up action and balancing action which prevents over-travel of the blade iii and assures that blade operation is accurately governable by movement of the operators grip 52. Following actuation of the blade 18 the operator merely relaxes his forward pressure on the grip 52 and the spring 54 moves the plate 5.3, rod Si) and grip 52 rearwardly. Such rear ward movement allows the valve 42 to close against the seat 43 and to move away from the seat 44 so that the air under pressure in the cylinder 13 is free to exhaust through the passage 45 to the atmosphere. This allows the spring 27 to return the pistou 25 to its initial position and to open the blade 18, the plate 53 and rod 5@ returning rearwardly with the piston. It is to be understood that the blade 18 may be operated, as above described, to any intermediate or partially operated position and partially returned, such actions being dependent entirely upon the workmans movement and positioning of the grip 52. It is to be noted that the piston 25 provided with the single fulcrum seal ring 26 and freely passing through the opening 29 may rock or tilt to a limited extent due to the arcuate movement of the pivot pin 35 during actuation of the blade 18, avoiding any frictional or binding action.

Having described only typical forms of the invention I do not wish to be limited to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear to those skilled in the art and fall within the scope of the following claims.

I claim:

l. A tool of the character described comprising a cylinder, a pair of cooperable cutting blades, one being relatively fixed the other being pivoted, a piston operable in the cylinder and connected with the pivoted blade to actuate the same, a port system in the piston for receiving actuating fluid pressure and having a passage leading to the cylinder and a passage leading to the atmosphere,

a valve in the piston passage system, the piston and valve being relatively movable between a first relative position where the valve prevents the flow of actuating pressure to the cylinder and puts the cylinder in communication with the passage leading to the atmosphere, and a second relative position where the valve permits the ow of actuating pressure to the cylinder and closes said passage leading to the atmosphere, and manually operable means for moving the valve relative to the piston to the second position and for restraining the valve against movement when the piston moves said other blade toward the active position.

2. A tool of the character described comprising a lcylinder, a pair of cooperable cutting blades, one being relatively ixed the other being pivoted, a piston operable in the cylinder and connected with the pivoted blade to actuate the same, means urging the piston and pivoted blade to inactive positions, a port system in the piston for receiving Iactuating fluid pressure and having a passage leading to the cylinder and a passage leading to the atmosphere, a valve in the piston passage system, the piston and valve being relatively movable between a rst relative position where the valve prevents the flow of actuating pressure to the cylinder and puts the cylinder in communication with the passage leading to the atmosphere, and a second relative position where the valve permits the flow of actutating pressure to the cylinder and closes said passage leading to the atmosphere, a movable member engageable with the valve and manually operable to allow the valve to move relative to the piston to said second relative position so that the piston is moved by the tluid pressure to actuate the pivoted blade, and means yieldingly urging the member toward the valve so that actuation of the blade is terminated when such movement of the piston brings the valve into engagement with the member.

3. A tool of the character described comprising a pair of cooperable blades, one blade being pivoted relative to the other, actuating means including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, :a system of communicating passages in the movable element including an inlet passage receiving actuating fluid'v pressure, a cylinder passage leading to the cylinder and an exhaust port, a valve in said system movable relative to the movable element between a iirst position where it closes said inlet passage and the exhaust port is open and a second position where it closes the exhaust port and the inlet passage is open to the cylinder passage, and .a manually movable member cooperable with the valve to hold it in said first position and movable to allow the valve to assume the second position until resulting movement of the movable element by the pressure admitted to the cylinder brings the valve to said iirst relative position to terminate such movement of the movable element.

4. A tool of the character described comprising a pair of cooperable blades, one blade being pivoted relative to the other, actuating means including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the later is operable by the former, a system of communicating passages in the movable ele- -ment including an inlet passage receiving actuating uid pressure, a cylinder passage leading to the cylinder and an exhaust port, a valve in said system movable relative to the movable element between a first position where it closes said inlet passage and the exhaust port is open and a second position where it closes the exhaust port and the inlet passage is open to the cylinder passage, a manually movable member cooperable with the valve to hold it in said first position and movable to allow the valve to assume the second position until resulting movement of the movable element by the pressure admitted to the cylinder brings the valve to said rst relative position to terminate such movement of the movable element, and means reacting between the movable element and said member yieldingly resisting movement of the member and movement of the valve from said position.

5. A tool of the character described comprising a body, a hand grip on the body, a pair of cooperable blades carried by the body, one blade being pivoted relative to the other, actuating means including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, a system of communicating passages in the movable element including an inlet passage receiving actuating uid pressure, a cylinder passage leading to the cylinder and an exhaust port, a valve in said system movable relative to the movable element between a first position where it closes said inlet passage and the exhaust port is open and a second position where it closes the exhaust port and the inlet passage is open to the cylinder passage, a movable member carried by the body and engageable with the valve to hold it in said rst position, a thumb grip on the member whereby the operator may move the member to vallow movement of the valve to the second position by the tiuid pressure in the inlet passage, and spring means resisting such movement of the member so as to normally hold the valve in said first position.

6. A tool of the character described comprising a body, a hand grip on the body, a pair of cooperable blades carried by the body, one blade being pivoted relative to the other, actuating means including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, a system of communicating passages in the movable element including an inlet passage receiving actuating uid pressure, a cylinder passage leading to the cylinder and an exhaust port, a valve in said system movable relative to the movable element between a irst position where it closes said inlet passage and the exhaust port is open and a second position where it closes the exhaust port and the inlet passage is open to the cylinder passage, a spring yieldingly urging the elements to the relative positions where the pivoted blade is in the inactive position, a movable member carried by the body and engageable with the valve to hold it in said first position, a thumb grip on the member whereby the operator may move the member to allow movement of the valve to the second position by the fluid pressure in the inlet passage, and spring means resisting such movement of the member so as to normally hold the valve in said rst position.

7. A tool of the character described comprising a body, a pair of cooperable blades carried by the body, one blade being pivoted relative to the other, actuating means including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, a spring urging the elements to the relative positions where the pivoted blade is in the inactive position, a system of communicating passages in the movable element including an inlet passage receiving actuating uid pressure, a cylinder passage leading to the cylinder and an exhaust port, a rst valve seat in the inlet passage, a second valve seat in the exhaust port, the seats being in spaced opposed relation, a valve arranged between the seats, the movable element and valve being related for relative movement so that the valve may assume a iirst relative position where it engages the tirst seat so that the spring holds the pivoted blade in the inactive position and a second position where it engages the second seat to admit actuating pressure to the cylinder to actuate the pivoted blade, and a member manually movable on the body engaging the valve to hold it in the lirst position and movable to allow the valve to be moved to the second position by the fluid pressure.

8. A tool of the character described comprising a body, a pair of cooperable blades carried by the body, one blade being pivoted relative to the other, actuating means on the body including two elements, one a cylinder the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, a spring urging the elements to the relative positions where the pivoted blade is in the inactive position, a system of communicating passages in the movable element including an inlet passage receiving actuating iluid pressure, a cylinder passage leading to the cylinder and an exhaust port, a first valve seat in the inlet passage, a second valve seat in the exhaust port, the seats being in spaced opposed relation, a valve arranged between the seats, the movable element and valve being related for relative movement so that the valve may assume a :'irst relative position where it engages the iirst seat so that the spring holds the pivoted blade in the inactive position and a second position where it engages the second seat to admit actuating pressure to the cylinder to actuate the pivoted blade, a stem on the valve projecting axially from an end of the movable element, and a manually movable member on the body engaging the stem to hold the valve in the iirst position and movable axially outward to allow the valve to move to the second position.

9. A tool of the character described comprising a body, a pair of cooperable blades carried by the body, one blade being pivoted relative to the other, actuating means on the body including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, a spring urging the elements to the relative positions where the pivoted blade is in the inactive position, a system of communicating passages in the movable element including an inlet passage receiving actuating fluid pressure, a cylinder passage leading to the cylinder and an exhaust port, a iirst valve seat in the inlet passage, a second valve seat in the exhaust port, the seats being in spaced opposed relation, a valve arranged between the seats, the movable element and valve being related for relative movement whereby the valve may assume a first relative position where it engages the irst seat so that the spring holds the pivoted blade in the inactive position and a second position where it engages the second seat to admit actuating pressure to the cylinder to actuate the pivoted blade, a stem on the valve projecting axially from an end of the movable element, and a manually movable member on the body engaging the stem to hold the valve in the rst position and movable axially outward to allow the valve to move to the second position, and a spring reacting between the movable element and the member urging the latter against the stem to hold the valve in the first position.

l0. A tool of the character described comprising a pair of cooperable blades, one blade being pivoted relative to the other, actuating means including two elements, one a cylinder, the other a piston, one element being relatively stationary, the other being movable, an operative connection between the movable element and the pivoted blade whereby the latter is operable by the former, a system of `communicating passages in the movable element including an inlet passage receiving actuating fluid pressure, a cylinder passage leading to the cylinder and an exhaust port, a valve in said system movable relative to the movable element between a rst position where it closes said inlet passage and the exhaust port is open and a second position where it closes the exhaust port and the inlet passage is open to the cylinder passage, a manually movable member cooperable with the valve to hold it in said first position and movable to allow the valve to assume the second position until resulting movement of the movable element by the pressure admitted to the cylinder brings the valve to said first relative position to terminate such movement of the movable element, and means reacting between the movable element and said member yieldingly resisting movement of the member and movement of the valve from said tirst position, the valve being shaped and proportioned so as to assume a position intermediate said first `and second positions to allow flow through the inlet passage and the exhaust port and thereby maintain the pivoted blade in an intermediate position when movement of the movable element closes with the pivoted blade in a desired position.

No references cited.

US654605A 1957-04-23 1957-04-23 Power actuated snips or shears Expired - Lifetime US2818643A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350780A (en) * 1966-05-13 1967-11-07 Artru Jean Portable shears
EP0647509A2 (en) * 1993-10-06 1995-04-12 Bettcher Industries, Inc. Hand held power operated shears
US5918371A (en) * 1993-10-06 1999-07-06 Bettcher Industries, Inc. Blades for hand held power operated shears
US6662452B2 (en) 2002-04-22 2003-12-16 Bettcher Industries, Inc. Power operated rotary knife
US20090271991A1 (en) * 2008-05-02 2009-11-05 Kett Tool Company Powered Hand-Held Metal Cutter
US20110314680A1 (en) * 2009-03-06 2011-12-29 Positec Power Tools (Suzhou) Co., Ltd. Shearing Tool
US9764486B2 (en) 2013-04-04 2017-09-19 Milwaukee Electric Tool Corporation Power tool

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350780A (en) * 1966-05-13 1967-11-07 Artru Jean Portable shears
EP0647509A2 (en) * 1993-10-06 1995-04-12 Bettcher Industries, Inc. Hand held power operated shears
EP0647509A3 (en) * 1993-10-06 1995-09-06 Bettcher Industries Hand held power operated shears.
US5476119A (en) * 1993-10-06 1995-12-19 Bettcher Industries, Inc. Hand held power operated shears
US5918371A (en) * 1993-10-06 1999-07-06 Bettcher Industries, Inc. Blades for hand held power operated shears
US5950313A (en) * 1993-10-06 1999-09-14 Bettcher Industries, Inc. Blades for hand held power operated shears
US6367156B1 (en) 1993-10-06 2002-04-09 Bettcher Industries, Inc. Blades for hand held power operated shears
US6662452B2 (en) 2002-04-22 2003-12-16 Bettcher Industries, Inc. Power operated rotary knife
US20090271991A1 (en) * 2008-05-02 2009-11-05 Kett Tool Company Powered Hand-Held Metal Cutter
US7971360B2 (en) * 2008-05-02 2011-07-05 Kett Tool Company Powered hand-held metal cutter
US20110314680A1 (en) * 2009-03-06 2011-12-29 Positec Power Tools (Suzhou) Co., Ltd. Shearing Tool
US9764486B2 (en) 2013-04-04 2017-09-19 Milwaukee Electric Tool Corporation Power tool

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