US1772944A - Electrical utility machine - Google Patents

Description

2 Sheets-Sheet 1 .ll lllvl l lllvllll I I r I l l l I l I l I I II F. P. GLUSH ELECTRICAL UTILITY MACHINE Filed May 5, 1928 Aug 12, 13&

yww/n Lm ea erlbll' Aug, 12, 1930. F. p. GLOSH 1,772,944

ELECTRICAL UTILITY MACHINE Filed May 5, 1923 2 Sheets-Sheet. 2

amen/0 0 Patented Aug. 12, 1936 v tlhitE rates ear-ear cert a FREDERICK P. GLOSH. OF CINCINNATI, OHIO, ASSIGNOR TO THE ECLIPSE MACHINERY COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OI-IIO ELECTRICAL UTILITY MACHINE Application filed May 5,

This invention relates to a mixing unit and has for an object the provision of a device of this character which is for general use.

Another object is to provide a device of the class referred to which is electrically driven and which hasembodied therein meansto effectively preclude injury to personor machine due to power actuation of the device While the parts are improperly positioned.

Another object of the invention is to provide the combined mechanical and'electrical interlock for a device or" this kind which renders it impossible to remove the mixing bowlwithout shutting off the power drive.

Another object is to provide an interlock of this kind which may be rendered inopera tive when the device is to be used for other than mixing purposes. 7 a

Another object is to provide a device of 2D this kind wherein the mixing bowl may be readily removed and inserted in operative position.

These and other objects are attainedby the means described herein and disclosed inthe 95 accompanying drawings, in which:

Fig. 1 is a side elevational view of the mixer of the invention, parts being shown in dotted lines. I p j I Fig. 2 is a cross sectional viewtaken on 30 line 22 of Fig. 1.

Fig. 3 is a cross sectional viewtaken online 3-3 of Fig. 1. r I

Fig.4 is a wiring diagram for the electrical control showing a conventionalstart push 35 button type electrical starting switch con 7 nected with the interlock of the invention.

The structure of the device is especially designed to provide parts that are individ ually simple and easy of fabrication and as 'sembly.

The base 12 has a short upright integral sleeve .13 into which a hollow column 14 seats and is secured against. rotation by set screw 15. The upper end of the column 1 1 has a flange 16 upon which a mixer head unit 17 is secured. Below flange 16 the column is provided with an interior transverse web 18. As shown in Figs. 1 and 3 the column is enlarged above web 18 to provide .an elevating gear box 19 having an opening 20 provided .1928. Serial No. 275,383.

with spaced projection 21 and closable by a bearing plate 22 by cap screw 23 extending through the plate into said projection. The plate carries integral bearing bosses 24 extending in alignment from opposite sides thereof. An elevating screw is j ournalled in web 18 at the top and in web 26 which forms a closure for the bottom of the column. A bevel gear 27 has a hub 28 which is pinned or otherwise fixed to the upper end of screw and supports said screw on web 18. An anti-friction collar 29 ispinned to the screw below web 26 and holds it against longitudinal movement in the column. It will be noted that the column and screw may be readily assembled on the'bench to form a complete unit for facile mounting in the base. The bearing plate 22-has a short crank shaft 30 journalle'd in bearing bosses 2 1 and secured against reciprocation by bevel gear 31 at one end and bull-wl1eel32 at the other end. This structure also provides a completely assembled unit for ready-mounting on the elevating gear box 19. Obviously the bevel gears 27 and 31' mesh when the units are assembled. The hub of the bull-wheel may be adjusted onshaft 30 to properly mesh the gears. An elevating sleeve 33; isadapted for telescoping or slidable movement over thehollow column 14: and is provided at its top with outwardly projecting lugs 3421161 at its bot tom with similar lugs 35. As will be noted in Fig; 2, these lugs 31 and 35 are in pairs, extending in alignment, on parallel diameters of the sleeve. Each pair or lugs has aligned seats 36 therein 1 for receiving the projecting ends of blocks 37' and 38 which are secured in their seats' by any suitable means such as screws 39. The blocks 37 and 38 have aligned threaded bores 10 for re ceiving the threads on elevating screw so that rotation of the screw by means of bullwheel 32 effects raising andlowering of the elevating sleeve 33 on column 1 1. The column has a" pair of guide slots 41 to preclude rotary movement of the elevatiru blocks.

The elevating sleeve has a pair of arms 4.2 and 43 extending outwardly adjacent the lower end and also an intermediate boss a l.

As is best shown in Fig. 1 the bowl receiving ring has on its lower face a lug which rests upon the forward end of arm 43. \Vhen the ring is in the position shown with the 'lu'gsi'esting' upon the ring supporting arms and boss all strain is taken off of the stud or pintle 460, the hinge lug 46 having its hearing at all times on the arm 42.

Means are provided to latch the bowl receiving ring in the positionshown, in Fig.1, both for the purpose of positioning the bowl relative to the mixer paddle hereinafter described and for relieving the pintle 46,0 of the weight of the ring, bowl and contents. The latching means thus precludes swinging of the bowl receiving ring and bowl about the pivotal mounting when in its operative position. V

The latching means is also adapted to cooperate with other mechanism of the device to serve as part of a combined mechanical and electrical inter-lock for insuring safety to the person of the operator and to preclude damage to the machine through inadvertence'.

As shown in Figs. 1 and 2 a bell crank lever 52 is pivotally mounted at 53 on the arm 43 adjacent the end thereof and has a notch 54 in its lower edge adapted to pass over a pin 55 formed on or integral with the ring 45. A suitable handle 56 permits facile manipulation of the bell crank lever 52 for locking and unlocking the ring 45 in and from operative position. A fork or yoke 57 is formed on the opposite end of bell crank 52. An electric switch 58 of-any suitable type, commonly referred to as a limit switch, is spring actuated to a normally open posi tion and is operable by a pivotally mounted lever 59 which is raised to close the switch by the lower portion of yoke 57 when the bell crank lever 52 is moved to theposition shown in Fig. 1 mechanically locking over the pin 55. lVires'GO and 61 are adapted to be electrically connected and disconnected bymeans of the limit switch 58. The wires 60 and 61 and switch 58 are cut into or thrown into series with the stop terminal of a one station puslrbutton type start and stop.

switch such as are readily purchasable in the open market and the details of which form no part of the present invent on. In

Fig. 4 there is shown a conventional wiring.

diagram for such one station start and stop switch with the normally open limit switch 58 connected thereto.

The mixer head unit 17 is in the form of a hollow housing in which suitable power transmission shafts and gearing are mounted for power drive connection from a variable speed electric motor 63 which is secured on the unit 17 directly over the top of column 14. Sprocket 64 on the motor shaft drives through chain 65 to turn a sprocket 66 to actuate the transmission mechanism (not shown) in the mixer unit 17. A suitable clutch (not shown) in unit 17 is operable by clutch lever 67 and serves to disconnect he motor drive from the transmission. Mixer shaft 68 is rotated and also revolved well understood by those versed in the art. The mixing paddle stem 69 is retained in a suitable socket in mixer shaft by any suitable means such as by a pin and bayonet slot connection 70 as shown. The length of the paddle is such that when the kettle or bowl 48 is in the lowered position (as in Fig. 1), the paddle may be inserted and removed from the shaft. The sleeve 33 is then raised by means of hand wheel 32 until the bottom of the bowl is closely adjacent the lower end of the paddle.

The motor 63 is of the variable speed type and is regulated by means of regulator handle 71. In this way a suitable range of speeds may be had without change speed gearing in the mixer unit 17. The motor may be one. of this type purchasable in the open marketwherefore its structural details are unneces-. sarv to this description.

The push button start and stop switch 72 has a start button 7 3 and a stop button 74. This switch is so arranged that whenever the circuit is broken, either by means of'the stop button or by opening of switch 58, the motor canbe again energized only by depressing start button 73. Whenever lever 52 is raised the switch 58 automatically breaks the circuit through wires 60 and 61. The breaking of this circuit instantly deenergizes the motor 68 and the switch 7 2 automatically assumes ofl position. It will be noted that if a careless operator attempts to remove the bowl when the mixer paddle is power actuated by the motor he will automatically shut off the power by raising the latching lever 52 which holds ring 45 in position. Likewise if the ring and bowl are carelessly moved toward operative position but are improperly positioned the lever 52 of the latching means will be held in a raised/position by pin 55. The circuit through limit switch 58 will remain broken so that movement of the start button will be ineffective. This will immediately direct attention to the fact that the parts are not in position for safe operation. .Vircs 60 and 61 are safely disposed beneath arm 43 and are of su'liicient lengthand flezgir bility to permit of the movement of sleeve 33 on the column. The wires are carried through the hollow interiors of the column;

, with the mixing bowl 48. The lever 52 may then be positioned so as to keep the limit switch 58 closed in order to control the power entirely by means of the start and stop button station. The hazard to person and machine is usually slight with devices other than the cake mixer so that there is little reason for requiring the operation of the limit switch when the bowl and mixer are out ofuse.

It will thus be noted that the device of the invention is of universal application to appliances requiring motive power for their operation. The device is therefore of great utility in hotel kitchens as well as in baker shops and other places.

What is claimed is:

1. A kitchen utility machine comprising a base, a column, an electrical driving unit on the column overhanging the base, a bowl receiving means vertically adjustable on the column, a control switch mechanism controlling the driving unit, a mechanical latch'for positioning the bowl receiving means relative to the driving unit and a limit switch connected in electrical series with the control I switch and movable to open and closed positions as the latch is moved to open and closed positions.

2. In combination a hingedly mounted receiving means capable of movement to operative and inoperative positions, an electrical driving unit mounted above the receiving means, a control switch for the driving unit, a mechanical latch for holding the receiving means in an operative position and movable to release the receiving means and a limit switch adapted for movement upon actuation of the latch in such manner as to render the control switch inoperative when the latch is open.

3. A utility machine of the class described comprising a column, an elevating sleeve comprising a pair of arms adjustable on the column, a bowl receiving means mounted for horizontal pivotal movement on one of said arms, a mechanicallatch on the other of said arms, means on the bowl receiver for engagement by the latch to retain the receiver in an operative position, an electrical drive means supported above the arms and comprising a control switch and a limit switch connected with the control switch and mounted on the arm which carries the latch and operable thereby and adapted to render the control switch inoperative when the latch is open.

In testimony whereof, I have hereunto subscribed my name this 1st day of May, 1928. FREDERICK P. GLOSH.

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