US2175368A

US2175368A - Exhaust control

Info

Publication number: US2175368A
Application number: US189960A
Authority: US
Inventors: Eugene G Wolf
Original assignee: Landis Machine Co
Current assignee: Landis Machine Co
Priority date: 1938-02-11
Filing date: 1938-02-11
Publication date: 1939-10-10
Anticipated expiration: 1956-10-10

Description

Oct. 10, 1939. 1 WOLF 2,175,368

EXHAUST CONTROL Filed Feb. 11, 1938 N3 IN I/HVTO /P 5 W/ 2/ aye/7e 0/ Patented Oct. 10, 193

UNITED STATES PATENT OFFICE EXHAUST CONTROL Eugene G. Wolf, St. Louis, Mo., assignor to Landis Machine Company, St. Louis, Mo., a corporation of Missouri The invention relates to the control of exhaust pipes such as are commonly used with machines having tools producing .dust or other loose material, when operated, which it is desired to remove 5 from around the tools.

The invention is particularly applicable to such a machine which is used intermittently and is connected to the same exhaust pipe as leads from another machine which may be run continuously.

10 The invention includes a device for opening and closing one or more branch exhaust conduits leading from certain tools and preferably this device is connected with shaft driving control mechanism whereby inlet to the exhaust pipe 15 will be opened and closed simultaneously with the starting and stopping of the machine.

The invention is illustrated in the accompanying drawing as applied to a shoe finisher machine common to shoe repair shops, but it will be understood this is an illustrative application of 'the invention and the same may be used in connection with various other machines operated under similar conditions. In the drawing- Figure 1 is a front elevation of a section of a 25 shoe finishing machine.

' Figure 2 is a transverse vertical section taken substantially on the line 22 of Figure 1 and showing the machine parts in running position.

Figure 3 is a similar section but showing the 30 machine parts in inoperative position. 7

Journaled in the machine frame I are the driver shaft 2 and an operating or tool shaft 3 which mounts a plurality of wheels 4 for sanding, buffing, grinding or trimming operations. At one end of the machine is a casing 5 which houses an exhaust fan suitably connected to the exterior of the building or to a dust collector (not shown) and an exhaust pipe 6 extends throughout the length of the machine and is connected to casing 40 5'and subject to the exhaust produced by the fan therein. An extension I of reduced diameter leads from the right hand end of pipe 6 for connection to another machine of similar or different structure which utilizes an exhaust conduit. It

45 will be understood that the exhaust fan in casing 5 is connected to driver shaft 2 and operates continuously throughout certain periods, while the tools mounted on shaft 3 are operated intermittently, sometimes for only a few minutes or even 50 a part of a minute.

The operative connection between

shafts

2 and 3 is eifected by a V belt 8 passing over pulleys 9 and I0 fixed to, the respective shafts, and an idler pulley I I is mounted upon a pivoted device,

5 indicated generally by the reference numeral I2,

whereby pulley I I may be moved to tense belt 8 on pulleys 9 and III to effect operation of shaft 3, as shown in Figure 2, or may be moved totheinoperative position, indicated in Figure 3, in which the driving shaft may rotate independently of the belt and operating shaft. This belt control is described in Patent. No. 2,047,362, issued July 14, 1936 to ErnestDunford, and in itself does not constitute the present invention.

An individual exhaust conduit I3 leads from 10 each of tools 4 to a corresponding inlet I4 in the side of the exhaust pipe 6. The inlets are provided with doors or closure plates I5 located inside pipe 6. A rod It extends substantially throughout the length of pipe 6 located near the uppermost part thereof, and is journaled in brackets I'I secured to the inner'face of the pipe. Each door includes, in addition to the fiat plate I5, marginal segments I8 stiffening the door plate and cooperating with the same to close the inlet.

Each door I5 is secured to rod I6 so that rota--- tion or oscillation of the rod. tends to swing the door towards the inlet to close the same, as shown in Figure 3, or awayv from the inlet towards the center of the pipe, as shown in Figure 2, to permit the passage of air through conduits I3 into pipe '6.

A finger I9 is secured to at least one door I5 (and preferably, but not necessarily, to each door). Each finger I9 extends through a restricted opening 20 in wall of pipe 6 adjacent to rod I6 and terminates in an upwardly extending cam-like element 2 I. s

The belt tightening device includes a manually actuated handle 22 pivoted to the frame at 23 and having a downwardly projecting lug 24 having a pin and slot connection to an arm 34, also pivoted at 23. A link 25 connects arm 34 to a crank 26 secured to a rod 2'! journaled on the frame and extending substantially throughout 0; the length of pipe 6, A plurality of cranks 28 depend from rod 21 and carry rollers 29 at their outer ends disposed to engage cams 2I. The pin and slot connection between lug 24 and arm 34 provides for adjusting the door mechanism to accommodate the most effective position of the idler pulley.

When operating handle 22 is shifted from the belt tightening position, shown in Figure 2, to the belt slackening position, shown in Figure 3,

elements

24, 34, 25, 2t, 28 and I9 swing all of the doors I5 against the currents of air passing through conduits I3 and close the inlets I4. This automatically cuts off the intake of air through the numerous lateral conduits I3 so that all of liq.v

the force of the exhaust fan draws air through pipes 1 and 6 from other machinery (not shown).

When operating handle 22 is shifted from the position shown in Figure 3 to the position shown in Figure 2 to tighten the belt and permit air to pass through conduits l3 into pipe 6, doors [5 swing by the force of gravity from the closed position to the open position and no thrust by the operator is required to shift the doors to open the inlets into the exhaust pipe. When operating handle is shifted in the opposite direction, the thrust of the belt against idler pulley ll works with the operator and tends to overcome the force of gravity and the push of the air currents resisting the closing of the doors. When the operating handle and associated parts are in the position shown in Figure 2, force applied directto door I5 is transmitted into a thrust or pull along the straight line Xwhich passes through both pivoted ends of lever 25 and pivot point 23 on the frame. Hence there is notendency to rotate lever 22 or shift the idler pulley.

Similarly when the parts are in the position shown in Figure 3, any force applied direct to door I5 is transmitted into a thrust or pull along the straight line Y which passes through the pivoted ends of crank 28 and pivot point 21 on the frame. Hence there is no tendency to move lever 22 or shift the idler pulley. The linkage is substantially locked or stabilized in either position and currents of air, etc., do not affect the belt tightening device. But upon manual operation of the lever the linkage is easily shifted to actuate the linkage.

The only parts of the inlet opening and closing structure subject to friction are the restricted portions comprising the bearings for rods 16.. and, if necessary, these surfaces may be easily.

oiled.

I am aware that it has been .suggestedpreviously to close a number of inlets into a similar exhaust pipe by means of doors slidingv along the inner wall of the exhaust pipe, but the structure described herein avoids the likelihood of a number of elements, having extensive interengaging sliding surfaces, sticking to each other because of too tight assembly, rust, accumulation of dirt, or other causes.

The machine illustrated has one door closing the openings from the three left hand sanding wheels, another door for closing the openings from the tWo middle wheels, and another door for the single opening from the right hand wheel, but it will be understood that a single long door could be substituted for all the openings or that each opening could be provided with an individual door. With the doors secured to rod 16, it is not essential that each door have finger l9 and associated linkage but when these parts are present, the doors may pivot aboutrod -16 and the latter may be stationary instead of being journaled as shown.

It will be apparent to those skilled in the 'art that other details of the structure may be varied substantially without departing from the spirit of the invention and I contemplate the exclusive use of all those modifications in parts and their assembly as come within the scope of theclaims.

I claim:

1. In combination with a cylindrical exhaust pipe having an opening through its side wall, a door pivoted along one edge of said opening and having curved portions for fitting the curved wall of said pipe and adapted to swing towards and away from said opening, a tool mounting shaft, a driving shaft, a manually actuated device for connecting said shafts, a finger on said door extending through the wall of said pipe and having a cam surface and pivoted to move with the door about the door pivot, a member connected to and moved by said device and engaging said cam surface to swing said door away from said opening when said device is actuated to connect said shaft.

2. In combination with an exhaust pipe having a plurality of lateral openings at spaced intervals, spaced doors for closing said openings, said doors being located within said pipe and each pivoted along the inner wall thereof to swing aboutan axis paralleling the pipe axis towards and away from said openings, a manually operable handle located exteriorly of said pipe, and a member extending along the outside of said pipe andfconnected to all of said doors and operable by said handle for manipulatingv the-.latter simultaneously.

3. In a shoe finisher assembly, afrarne, an

elongated shaft with a plurality of sanding wheels and like tools mounted along said shaft,.an elon-- gated exhaust pipe paralleling said shaft, individual conduits leading from each of said-tools.

to corresponding inlets in said 'pipe, a rodwithin said pipe and journaled adjacentthe inner top thereof and extending abreast of all of said .in lets, respective doors for said inlets eachsecured at its upper edge to said rod, a driving shaft,

respective pulleys on said shafts, a belt between said pulleys, a belt tightening device including a manually operated handle,'and a connection between said device and said rod for oscillating the latter when said belt is tightenedandslackenedto open .and close said doors respectively.

4. In a'structure of the class described, a .driving shaft, an operating shaft, dust producing tools mounted on said latter-mentioned shaft, a.- belt forming a driving connection betweensaid shafts, means for tightening and slackening said.

belt including a shiftable handle, a dust exhaust air conduit leading from said tools, a door hinged.

at one side of said conduit and movable about its hinge with or against the current offairt. through said conduit to open or close said.conduit, elements connecting said handle andisaid' door whereby shifting of said handlemoves said M door to open or close said conduit, saidelements being constructed and arranged to resistmovement of said door from open or closedposition by.

air pressure on said door.

5. In a structure of the class described, an exhaust pipe, an opening in'the side wall thereof for conduits leading from a dust producing tool, a door for said openinghinged at one side thereof to swing towards and away from said opening,

a manually operative handle having a pivot on the'structure, linkage having a stationary pivot on the structure and connected .to said handle and said door for moving the latter to and from a position in which it closes. said opening, saidlinkage assuming a position when said door. is

closed in which the line of thrust between 'said lever having a pivot on frame, a dust producing tool mounted on said operatingshaft a dust exhaust conduit leading from said to'ol,"a

door for closing said conduit, a, member having a pivot on said frame for opening and closing said door, elements connecting said handle and member whereby movement of said handle moves said door, said elements being arranged sothat the line of thrust between said handle and door is through at least one of said pivots whether EUGENE G. WOLF.