US2391142A

US2391142A - Toolholder

Info

Publication number: US2391142A
Application number: US540389A
Authority: US
Inventors: Jerry H Drake
Original assignee: HENRY M HERBENER
Current assignee: HENRY M HERBENER
Priority date: 1944-06-15
Filing date: 1944-06-15
Publication date: 1945-12-18
Anticipated expiration: 1962-12-18

Description

J. H. DRAKE TOOL HOLDER I Dec. 18, 1945.

' Filed Jun 15, 1944 2 Sheets-Sheet l Dec. 18,1945.

J. H. DRAKE TOOL HOLDER Filed June 15, 1944 2 Sheets-Sheet 2 28 1 1 I 29 lo 1 71/ Patented Dec. 18, 1945 Jerry H. Drake,

Henry M. Herbene Thomasville, GaL, assignor to r, Thomasville, Ga.

Application June 15, 1944, Serial No. 540,389 9 Claims. (01. 29-975) My invention relates to holders for tools used i threading, cutting oif, key-seating, or the An important object of the invention is to pro- Vide a tool holder of the above mentioned character, which will yield to. permit of the tool moving from the work, when too much material is being taken off or when an extra hard spot is encountered, or the like. I

A further object of the invention is to provide a tool holder of the above mentioned character having means for holding the tool against movement at the selected cutting position, when the tension of the spring controlling the action of the tool is varied.

A further object of the invention is to provide a tool holder of the above mentioned character which is strong and is capable of employing a sufiiciently heavy or stiff spring.

A further object of the invention is to provide a tool holder of the above mentioned character, which will have a yielding action, when doing heavy work, While the same may function as a rigid tool holder when doing light work.

A further object of the invention is to provide a tool holder of the above mentioned character which may be used by an inexperienced operator or in connection with automatic machinery, without liability of breaking the tool or cutter.

A further object of the invention is to provide adjustable pivot means for the tool carrying member, wherein the slack caused by wear can be taken up, so that the holder will be precise or true in operation.

A further object of the invention is to provide a tool holder so constructed that the tool carryingmember or lever may have a long arm acted upon by the spring, whereby the desired leverage is obtainable, for the proper operation of the device. 7

Other objects and advantages of the invention will be apparent during the course of the following description:

In accompanying this application and employed to designate same,

drawings forming a part of in which like numerals are like parts throughout the Figure 2 is a plan view of the same, Figure 3 is a frontend elevation of the same, Figure 4 is a rear end elevation of the same, Figure 5 is a transverse vertical section taken online 5-5 of Figure 1, and 7 Figure 1 is a side elevation of a tool holder embodyingmy invention,

sleeve I4 is provided at standing projection l3. 7 ,is provided in its top with a screw threaded open- ,ing H to receive a set-screw l8.

disposed upon formed integral with the side-arm l0 and pref' erably disposed at a right angle thereto and is adapted to be clamped in lathe or other machine.

The side-arm I0 is provided at its forward end with an upstanding projection l3, preferably formed integral therewith and arranged at a right angle thereto in the same plan. The upstanding projection I3 is provided with a horizontal bearing sleeve l4, preferably integral therewith. This bearing sleeve is arranged at the top of the upstandingprojection l3 and extends transversely of the projection l3, preferably at a right angle thereto. The bearing sleeve M has a cylindrical bore IS. The bearing sleeve l4 projects laterally beyond the upstanding projection l3, upon opposite sides of the same, and the bearing one end with a tapered face I 6, which is circular in cross-section and decreases in diameter outwardly from the up- The bearing sleeve It A pivoted tool holding member or lever I9 is spaced parallel relation thereto. This tool holding member or lever is provided between its ends and nearer its front end with an upstanding projection 20, preferably formed integral therewith This.

and arranged at a right angle thereto. upstanding projection 20 is provided at its top with a bearing sleeve 2|, preferably integral therewith. 'This bearing sleeve has a tapered recess 22, increasing in diameter outwardly, to snugly receive the tapered face H5. The bearing sleeve 2| also has a tapered recess 23 increasing in diameter outwardly. The reduced ends of

recesses

22 and 23 are in communication with a short cylindrical bore 24 of the bearing sleeve 2|, as

shown. At'its top, the bearing sleeve 2| has a hole 25 for receivinga lubricant and leading to the bore 24.

The numeral 26 designates a cylindrical pin which fits snugly within the cylindrical bore 15 and this pin is provided at one end with a head 21, which is circularin cross section, and tapers the tool post 12 of a one side of the side-arm to, in

inwardly, and is adapted to snugly fit within the tapered recess 23. The pin 26 is provided with an upper flat 28, for clamping engagement with the set-screw l8. The pin 26 has a screwthreaded extension 29, for engaging with a nut 30. By manipulating the nut 30 the slack or play between the portions l6 and 2|; and 21 and 2| may be properly taken up, so that the tool carrying member or lever I3 is accurately pivotally supported at the top of the projection 20, and after this adjustment is made, the pin 26 is clamped in the selected adjusted position by the set-screw I 8. The tool holding member or lever It therefore has a short arm 3| projecting forwardly of the pin or pivot-26 and a long arm 32 projecting rearwardly of the same. The

the tool 34 moves from the work, and relieves the strain upon the tool, thus preventing injury to the tool or the work. Should it be desired to change the tension of the spring 42 while the device is in operation and the stop screw 48 is engaging the side-arm [0, the screw 40 is turned to increase the tension upon the spring, but this arm 32 may therefore be sufi'iciently long to produce the desired leverage.

The short arm 3| is provided with an opening 33, for receiving the tool 34, arranged to engage the work 35. This tool is clamped in place by a set-screw 36,

At its rear end the member or lever 49 is provided with an upstanding arm 37, preferably formed integral therewith. This upstanding arm is provided at its top with a horizontal or lateral extension 38, provided with a head 39, having a vertical screw threaded opening for receiving an adjusting screw 40. This adjusting screw is arranged to engage a head or disk 4| applied to one end of a heavy stifi compressible coil spring 42. The head or disk 4| has a boss 43 extending into the bore of the coil spring 42. At its lower end, the coil spring 42 engages a lateral extension 44 of the member or lever 19- which is preferably formed integral therewith. The extension 44 carries an upwardly projecting boss 45, extending into the bore of the coil spring 42.

The tool holding member or lever I9 is provided with a stop device, for retaining the tool 34 in the selected cutting elevation when the tension of the spring 42 is changed or adjusted by manipulating the screw 40. This stop device comprises a horizontal arm 46, rigidly secured to the member or lever I9 between the projection 28 and the spring. 42. The arm 46 is arranged above the arm 32 and is preferably formed integral with the upper edge of the arm 32. The horizontal arm 45 extends over the side-arm It, as shown. The arm 46 has a vertical screw threaded opening 41 receiving an adjustable stop-screw 48, to be locked in the selected adjusted position by a lock nut 49. This set-screw is arranged to engage the upper edge of the side arm it, as shown.

The operation of the device is as follows: The shank H is clamped within the tool post I2 of the lathe or like machine and the tool 34- is brought to the selected cutting elevation, which is determined by the adjustment of the stop screw 48 engaging the side-arm Hi. By adjusting the stop screw 48 the elevation of the tool 34 may be varied. The coil spring 42' is now placed under suitable tension by turning the screw 4!]. When the tool 34 is to do heavy work, the spring 42 is placed under high tension. Under normal cutting conditions, the spring 42 will retain the arm 32 in the lowered position and clamp the stop screw 48 against the side-armi il. However, should the tool 34 out too deep or take off too much material, or encounter an extra hard spot in the work, the tension of the spring 42 or lever 19 will swing upon'the pin26, whereby increased tension cannot move the member or lever [9 with respect to the said arm 10 and hence the elevation of the tool 34 is not varied. When the device is used for light work, the tension of the spring 42 may be such that it will never be overcome, in which event the device will then operate as a rigid tool holder.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described my invention, what I claim is:

l. A tool holder, comprising a side-arm provided between its ends with a lateral shank to be secured to a tool post, a tool holding member disposed upon one side of the side-arm and pivota'lly mounted between its ends upon the sidearm near one end of the side-arm the tool holding member having short and long arms extending upon opposite sides of its pivot, an arm mounted upon the opposite end of theSidei-arm, and a spring engaging the last named armand the rear end of the long arm of the tool holding member.

2. A tool holder, comprising a side-arm having a laterally extending shank to be secured to a tool post, an upstanding projection carried by the side-arm near one end thereof, a lever disposed upon that side of the side-arm which is remote from the Shank, an upstanding projection secured to the lever near one end thereof, means pivotally connecting the upper ends of the projections. an upstanding arm secured to the sidearm near its opposite end and having a lateral projection extending over the lever, a compressible coil spring arranged between the lateral projection and lever, and means to secure a tool to the lever.

3. A tool holder, comprising a side-arm to be secured to a tool post or the like, a tapered element secured to the side-arm, a bearing sleeve having a. tapered. recess to pivotally receive the tapered element, adjustable means to draw the bearing sleeve axially upon the tapered element. a lever carried by the bearing sleeve, a spring acting against the lever and side-arm, and means to secure a tool to the lever. a

4. A tool holder, comprising a side-arm, means to secure the side-arm to a tool post or the like. a bearing sleeve secured'to the side-arm and having a tapered face, a second bearing. sleeve having tapered recesses in its ends, one tapered recess receiving the tapered face. a pin arranged within the first bearing sleeve and having a ta-- peredv head arranged within the other tapered recess, means to adjust the pin axially, means, to clamp the pin in the selected adjusted position, an arm carried. by the last named sleeve, a spring acting against the arm and side-arm, and mean; to secure a tool to the arm.

5. A tool holder, comprising a generally horizontal side-arm provided with a shank to besecured to a tool post, a generally horizontal tool holder arranged upon one sideof the side-arm and pivotally mounted upon the side-arm to turn upon a transverse axis with relation to the side arm, anarm secured to the side-arm and having an extension projecting across the tool holder,v

and a spring arranged between said extension and tool holder.

6. A tool holder, comprising a generally horizontal side-arm provided with a shank to be secured to a tool post, a generally horizontal toolholding member arranged upon one side of the side-arm, a pivot element arranged near one end of the side-arm and extending transversely through the side-arm and tool-holding member,

an upstanding arm secured to the side-arm near its opposite end and provided with a lateral extension extending over the tool-holding member, and a compressible coil spring arranged between the lateral extension and the tool-holding member.

' LA tool holder, comprising a side-arm to be secured to a tool post or the like, a lever arranged near the side-arm and extending longitudinally thereof, a pivot element extending transversely of the side-arm and lever for pivotally connecting the side-arm and lever and arranged near one I end of the lever, means arranged near the pivot element for securing a. tool to the lever, a spring engaging the lever near its opposite end, adjustable means mounted upon the side-arm and engaging the spring to regulate its tension, and a stop element secured to the lever and arranged to engage the side-arm to limit the movement of the lever upon the transverse pivot element.

its tension, and an adjustable stop mounted upon the lever and arranged to engage the side-arm to limit the movement of, the lever upon the transverse pivot element.

9. A tool holder, comprising a side-arm provided with a laterally extending shank to be se- 7 cured to a tool post, a lever disposed upon one side of the side-arm and extending longitudinally thereof, a pivot element connecting the lever and side-arm and extending transversely of the lever and side-arm and arranged near the forward end of the lever, said lever being provided near its forward end with means for holding a cutter, said lever having a long arm, a spring acting upon the rear ends of the side-arm and lever, and a bolt having screw-threaded engagement with the lever and arranged to engage with the side-arm and serving as an adjustable stop.

JERRY H. DRAKE. V