US2686600A

US2686600A - Traversing hoist

Info

Publication number: US2686600A
Application number: US312456A
Authority: US
Inventors: Charles R Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-10-01
Filing date: 1952-10-01
Publication date: 1954-08-17
Anticipated expiration: 1971-08-17

Description

Aug# 17, 1954 c. R. SMITH 2,686,600

TRAVERSING HOIST 5 Sheets-Sheet 1 Filed Oct. l, 1952 CWM Aug. 17, 1954 Q R. SMITH 2,686,600

TRAVERSING HoIsT v Filed oct. 1, 195:2 i 5 sheets-Sheet 2 Aug. 17, 1954 R SMH 2,686,600

TRAVERSING HOIST Filed Oct. l, 1952 5 Sheets-Sheet 3 Aug. 17, 1954 c. R. SMITH 2,686,600

TRAVERSING Hors'r I Filed Oct. l, 1952 5 Sheets-Sheet 4 Aug. 17, 1954 c. R. sMrrH TRAvERsING HoIsT 5 Sheets-Sheet 5 Filed 001:. l, 1952 Patented Aug. 17,1954

UNITED STATES PATENT OFFICE TRAVERSING HOIST Charles R.. Smith, Cassopolis, Mich. Application October 1, 1952, Serial No. 312,456

2 Claims. l

This invention relates to traversing hoists of that type adapted for use particularly by roofers and builders but capable of many other uses. The instant invention is a further development of the hoists forming the subjects of my Patents No. 2,305,202 granted December 15, 1942; No. 2,379,599, granted July 3, 1945; and No. 2,591,974, granted April 8, 1952.

One object is to provide a hoist wherein the swinging boom is so supported that it may be swung through an arc of more than 180 degrees, that is very easy to swing and that is provided with instantly operable locking means for securing the boom in adjusted position. A further object is to provide a hoist which in addition to conventional manually controlled brakes is provided with hydraulic automatically operated brakes effective only in the event of failure of the hand brake mechanism, the cut-off of power supply to the hoist or the stoppage of load lifting means, without applying the hand brakes, while a load is being raised.

A still further object is to provide a hoist of light weight but durable construction, mainly tubular, that is readily portable, easily erected and supported in position and as readily dismantled for removal to another site.

Other objects, novel features and advantages of arrangement, construction and design comprehended by the invention are hereinafter more fully pointed out or made apparent from the following description of a preferred embodiment as illustrated in the accompanying drawings and dened in the claims.

In the drawings:

Fig. l is a side elevational view of a hoist according to the instant invention and illustrating an application thereof to a structure, a portion of which and the motor being omitted.

Fig. 2 is a fragmentary front elevational View of the hoist with certain adjustable parts shown in altered position in broken lines.

Fig. 3 is a detail sectional View taken substantially on the line 3-3 of Fig. 2.

Fig. 4 is an enlarged fragmentary View, partly in section and partly broken away, of the clutch and control means therefor.

Fig. 5 is a top plan view of Fig. 4.

Figs. 6, 7 and 8 are enlarged detail sectional views taken, respectively, on the lines 6 6, 1 -l, land 8 8 of Fig. 4.

Fig. 9 is a fragmentary front View, reduced, of Fig. 1.

Fig. 10 is a fragmentary side elevational view of .a portion of the frame and the motor and cable drum, enlarged.v

Fig. 11 is a top plan view of Fig. 10.

Fig. 12 is a view in side elevation, enlarged, of the hydraulic braking mechanism and associated parts.

Figs. 13, 14 and 15 are views taken, respectively, on the lines I3 I3, Ill-I4, and I5-l5 of Fig. 12, and,

Fig. 16 is a plan view showing several positions of the boom and associated structure.

The hoist is adapted for disposal upon the roof of a structure I and is ordinarily located close to the re wall or coping 2 and `includes a jack 3 having a desirably tubular base 4 that carries a standard 5 connected to said base by the long leg 6 which is further secured to said standard 5 by the braces 1. Secured to the standard 5 as by welding and offset to a common side thereof are the lower tubular bracket 8 and the upper tubular bracket 9, said brackets being in line with each other and supporting the boom I0 that swings about the jack. A short leg II connects the bracket 8 with the base 4, the upper end of said leg being below the swinging boom so that it swings above and clear of same.

Secured to the jack 3 is a U-bracket I2 that carries a hinge pin I3 to which one end of the leaf spring I 4 is secured that normally extends outwardly and yieldingly upwardly substantially Y at right angles to the jack in the path of movement of the boom I0 for engaging relation with the latch I5 carried by and depending slightly below the angular bracket I6 fast to said boom, thespring and latch serving to yieldingly retain the boom in a position substantially at right angles to the jack, the spring being manually movable to raised inoperative position, as in Figs. 2 and 3, when the hoist is not in use. The boom I0 at its free end carries the conventional sheave Il over which the cable I8 passes that carries the hook I9 for engagement with the load, cable I8 passing over a sheave'2, carried between the ends of the open ring 2l welded to the upper end of the jack at an angle thereto.

With the boom I0 in line with the truss bar the cable I3 passes through the ring 2| to and over the sheave I'l. When the boom is swung to the dotted line positions, Fig. 16, the cable I8 is caused to move from the ring 2I into the groove of the pulley 20. When the cable I8 moves from the center of the ring into the groove of the pulley, the load on the free end of the cable pulls the boom until it comes in line with the groove of the pulley which causes the load to move across the re wall above the roof of the on the roof thus showing that the boom is moved automatically by the load.

Referring again to the spring I4, when in use it is under tension due to the fact that it passes from the pin I3 over the upper edge of the U-bracket I2 to the latch I5. From the position of the boom, Fig. 12, with respect to the jack 3 the boom I8 may be readily moved in a clockwise direction by manually urging it slightly, to any of the positions denoted in broken lines. The full line position shows the boom substantially at right angles to the nre wall 2, the broken lines showing movement toward that wall. Secured fast to the jack in the path of the boom is the angular boom stop 22, the free end 23 thereof when engaged by the boom arresting boom movement in the direction of said stop.

The cable I8 beyond the sheave 28 extends to and about the cable drum 24, after passing between vertical guide rollers 25, fast upon shafts 26 journaled in bearings 2'! carried by the winch frame 23 secured to and supported by the brace frame 29 carried by the truss bar 39 secured by bracket 3l to the jack. When the boom in full line position, Fig. 16, carries a load by the hook I9, the spring I4 being released from latch I5, a slight push upon the load or boom in a clockwise direction Will cause the boom with the load to move in the direction indicated by the broken line positions so that the load is carried over the re wall and above the roof. When the load is removed from the hook the boom may be moved easily by hand in an anti-clockwise direction into engagement with the stop 22 where it remains for further use, the spring I4 being placed again in engagement with the latch I5.

Secured to the winch frame 29 and extending laterally therefrom is a bracket 32 that is secured by bolts 33, Figs. 4 and 5, to a short sleeve 34 formed with a transverse slot `35 receiving a headless screw 38 carried by an inner sleeve 31 of greater length than sleeve 34 and extending beyond the ends thereof, said sleeve 3'! receiving a lever 38V secured thereto by the screw 39 and provided With a handle 49. The short sleeve 34 is desirably welded to the part 4I of the clutch yoke 4I, 42, the part 4I being secured to the bracket 43 secured by bolt 44 to the clutch yoke member 4I and to sleeve 34.

Secured to the sleeve 3'I and carried thereby is the angular bolt 45 connected to the wire 45 by bolt 4'I, said wire extending through conduit 48 to the carbureter 49 for the motor 59 arranged upon the tilting platform I carried by the winch frame. Turning the handle 40 of the lever 38 will partially rotate the sleeve 3'! causing the bolt 45 to move the wire 48 longitudinally to control the flow of fuel to the engine from the carbureter, this handle being within easy reach of an operator on the roof.

Operatively engaged by the yoke 4I, 42 is the clutch within clutch housing 52 provided with sprocket wheels 53, 54, 55 selectively connected by chain 56 to sprocket wheels 51, 58, 59 respectively, arranged upon the motor shaft 58, sprocket wheels 53, l54, y55 being fasti upon shaft 55a journaled in bearings in frame 29. Referring again to the tilting platform 5I, same is connected by hinge SI to the frame 29 at one end, the opposite end of said platform supported by the plunger rack 52 connected by a pinion (not shown) to operating handle 63 carried by and operative in housing 84 supported upon leg 55 carried by said frame 29, By rotation of the handle 63 in one direction the adjacent end of the platform may be raised, or lowered by moving said handle in the opposite direction, said platform in its raised position slacking the chain 5S to permit manual shifting of same to another set of sprocket wheels, thus varying the speed of the engine.

One end of shaft 55a, is square in cross section for engagement by a crank if at any time necessary. Fast upon shaft 55a is a pinion 56, Fig. l1, engaging gear wheel 51 fast on shaft 26. Also fast upon shaft 25 is the brake drum 69 engaged by brake band 'I8 one end of which is secured to said frame and the opposite end to the control lever 'II fulcrumed to a standard 'I2 carried by said frame, said lever engaged by a brake cord 'I3 connected to the jack. A spring 'i4 connects the lever 'II to a stand 'I5 carried by brace frame 29. A clutch lever 'IB fulcrumed to the frame 29 engages a sliding collar keyed to shaft 55a to throw the cable drum in and out of operation in well known manner.

Referring toI Figs. l() through 16 an hydraulic control mechanism for the cable drum is shown for controlling the speed of same when lowering a load from the roof to the ground. Secured to the base of the tilting platform 5I by fixture 'I'I is a heavy-fluid circuit 'I8 containing a suitable iiuid, the circuit being full of fluid at all times and kept in this condition by fluid from a reservoir 'i9 communicating with same and carried by said platform. A pressure gauge 89 is provided for the circuit to indicate the pressure of the liquid. operatively arranged in the circuit is a check valve 8| provided with spring 82 permitting iiow of liquid in a clockwise direction but arresting flow in an anti-clockwise direction.

Flow of the liquid through the circuit in a clockwise direction is set up by means of the pump 83 driven by the sprocket wheel 84 by chain 85 from sprocket wheel 85 fast upon the shaft 55a. Tapped into the circuit upon opposite sides of the pump is an auxiliary or minor circuit 81 provided with a control needle valve 88 manually operated and capable of being set to determine and control the amount and speed of liquid flow through said minor circuit.

In operation the pump is driven from the shaft 55a and the liquid in the main circuit 'I8 is forced through the circuit in a clockwise direction with negligible resistance from the check valve 8| when a load is being raised by the hoist mechanism. Should the hoist be stopped with the load above the ground and below its upper destination, or should the hand controlled braking mechanism fail to hold for any reason, or should the power be shut off the weight of the load would ordinarily reverse the hoist mechanism and the load would descend at too rapid a speed to the ground. With the automatic hydraulic braking mechanism, however, the rapid descent of the load would be checked as reversal of shaft 55a would reverse the pump 83 thus tending to reverse the flow of liquid in the main circuit, but such flow would be effectually arrested by the check valve 8| whereupon a flow of predetermined speed through the minor circuit would be set up which would be of sufficient power to reduce the descent speed of the load to a non-dangerous point all the way to the ground.

What is claimed is:

1. In a hoist, a jack, a swinging boom carried thereby, a sheave at one end of said boom, a truss bar carried by said jack, a cable drlum carried by said truss bar, an open ring fast to the upper end of said jack at an angle thereto, a

pulley carried between the ends of said ring substantially at right angles thereto, a cable about said cable drum extending longitudinally of said truss bar and of said swinging boom and over said sheave, said cable in aligned position of said truss bar and swinging boom passing through said ring, said cable as said boom is moved into a position substantially at right angles to said truss bar moved, by said boom, about said pulley.

2. In a hoist, a jack, a swinging boom carried thereby, a sheave at one end of said boom, a truss bar carried by said jack, a cable drum carried by said truss bar, an open ring fast to the upper end of said jack at an angle thereto, a prulley carried between the ends of said ring in a position substantially at right angles to said ring, and a cable about said cable drum extending along said truss bar and said swinging boom and over said sheave, said cable in a predetermined position of said boom relative to said truss bar extending through said ring and in predetermined positions of said swinging boom extending through said ring and over said pulley.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date r 1,801,932 Woodford Apr. 14, 1931 2,246,923 Meunier June 24, 1941 2,315,628 Lamond Apr. 6, 1943 2,557,852 Winkel June 19, 1951 2,591,974 Smith Apr. 8, 1952