US1451687A - Electrically-heated burnishing machine - Google Patents

Description

Apr. 17, 1923. 1,451,687

H. E. DOW

ELECTRICALLY HEATEDQBURNISHING MACHINE Filed May 6, 1921 Patented Apr. 17, 1923.

UNITED STATES I ELECTRICALLY-HEATED BURNISHING MACHINE.

Application filed May 6, 1921.

To all whom it may concern:

, Be it known that I, HARRY E. Dow, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Electrically-Heated Burnish ing Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

his invention relates to electrically operatedmachines and is disclosed as embodied in a machine for burnishing the sole edges of boots and shoes, of the well-known type known as the Union edge setting machine.

Considerable difficulty has been experienced in machines having electrically heated moving tools in conveying the electrical energy to the electric unit, if the unit is mounted upon or close to the moving tool as it should be for the sake of economy and heat energy, since the motion of the tool carrier soon destroys the leads used in conveying the electricity from the fixed frame to the moving tool carrier. The invention of F. E. Boothroyd as described and claimed in his Patent No. 1,410,053 granted Mar. 21, 1922, solved thisproblem by 3 providing comparatively short spiral spring leads, preferably under a, state of compression, with their axes substantially straight extending between the moving tool carrier and the fixed frame of the machine.

An important object of the present in vention is still further to improve the construction of machines of this type by obtaining certain economies in construction which. will hereinafter appear.

40 The Union edge setting machine as is well known, carries a shank and forepart edge setting tool which are interchangeable at will by the operator upon pushing back a latch which holds them in position. I

' have found it advantageous to utilize the springs which control this latch as leads for the conduction of electric energy to a unit held in the vibrating tool carrier.

Accordingly an important feature of the invention consists in an organization comprising a tool holder, an electric unit on the holder, a latch and a spring acting to operate theglatch and conduct electric current to the unit.

This and other features of the invention Serial No. 467,459.

comprising certain combinations and arrangements of parts will be understood from the following description of a preferred embodiment thereof selected for purposes of illustration and shown in the accompanying drawings in which,

Fig. 1 is a side elevation, partly broken away;

Fig. 2 is an exploded View leads and associated elements;

Fig. 3 is a section on the line, 33 of Fig. 1.

The machine has an oscillating tool carrying head 10 oscillating about the center 12 in a well-known manner. The head 10 has a forwardly positioned extension 14 within which is mounted a slida-ble closely fitting sleeve 16 projecting from its front end. This sleeve has two laterally projecting lugs 18, 20, each of which has a forward extension 22 extending through a slot 24 in a flange 26 forming the front end of the extension 1%. Mounted upon the projecting end of the extension 14 and fitting against the flange 26 is a rotatable tool carrier 28 carrying two edge setting tools 30 and having two notches in its rear side in which the ends of the extensions 22 latch. Pressure upon the handle 32 mounted on the end of the sleeve 16 pushes it back carrying with it the extensions 22 and releasing the tool carrier which can then be pushed around by the operator to interchange the tool after which release of the handle 332 permits re-latchin into position. The sleeve 16 has mounted within it an electric unit 34 fo heating the tools. Mounted upon the rear end of the sleeve 16 is a block 36 of fibre or other insulating material having two sockets 38 in its face, these sockets havcopper terminal blocks 40 at their hot toms. Mounted upon the frame of the machine directly opposite the block 36 is a similar. block 4-2 with registering sockets and copper blocks. Extending between each pair of sockets is a spring 44 with its ends seated against the copper blocks. This spring is spiral in form with its axis substantially straight and is preferably under compression when, in position in order to keep it firmly in contact with the copper blocks 40 without the necessity of binding screws whichv would tend to overstrain and break it at the point of contact. These springs perform the double function of of, the spring able on said holder,

thrusting the sleeve 16 forward and there by maintaining the tool holder in latched condition and communicating electric energy to the the unit 84, the terminals 46 of-the 'unit being connected. to the moving pair ofblocks tO'andth'e immovable pair of copper blocks 40 being connected to the mains as indicated. 'The'springs 44, whose length is not long as compared with their diameter, and whose axes are substantially straight, as desoribed,;are sufficiently stiff to prevent any substantial bending under their own weight and are not therefore thrown about loosely because of their own inertia. It has been found that leads of this form are not subject to the fatigue and deterioration that-has been'experienced with other-types of leads for conducting electric energy to a moving part.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is l. In a machine of the class described, a

moving tool holder, a reversible tool carrier on said-holder, a latch for holding said carrier inoperative position, a spring extend- I ingbetween said latch and the fixed frame said unit and to a source of electrical energy, respectively.

3. In a machine of the class described, an oscillating tool holder, a tool carrier movable on said holder, latch on said holder for holding said carrier in operative position, a block positioned near'thefixedframe o'fthe machine and operatively connected with said latch, a corresponding blockmounted on the frame of the machine opposite the first-named block, a spiral spring extending between said blocks to hold said latch inoperative position by pressure upon said first I namedblockthe length of said spring notbeing more than ten timesits'diameter, and said spring being sufficiently stiff to avoid substantial'bendi'ng un'derits own-weight when supported at its ends between said blocks.

4; In a machine of the class described, an oscillating tool holder, a tool carrier movable on said holder, a latch'onsaid holder for holding said carrier in operativeposition', a blockpositioned near'thefixed-frame of the machine and operatively connected with said latch, a corresponding block mounted on the frame of the machineopposite the first-named block, a spiral spring extending between said blocks to 'hold said latch in operative position by pressure'upon saidffirst-named block, the length ofsaid spring not being more than ten times its diameter and said spring being sufficiently stiff toavoid substantial bend ing under its own Weight when supported at its ends between said blocks, and being under compression. i

In testimony whereof I have signed my name to this specification.

HAR Y new.

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