US2591974A

US2591974A - Traversing hoist

Info

Publication number: US2591974A
Application number: US45345A
Authority: US
Inventors: Charles R Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-08-20
Filing date: 1948-08-20
Publication date: 1952-04-08
Anticipated expiration: 1969-04-08

Description

April 8, 1952 c. R. SMITH TRAVERSING HoIsT 2 SHEETS-SHEET 1 Filed Aug. 20, 1948 April 8, 1952 c. R ySMITH TRAVERSING HoIST 2 SHEETS-SHEET 2 Filed Aug. 2o, 1948 I (Ms Patented Apr. 8, 17952 UNITED STATES PATENT OFFICE TRAvEnsING nols'r charles a. smith, chicago, lu.

Application August 20, 1948, Serial No. 45,345

4 Claims.

This invention relates to traversing hoists of the type particularly adapted for roofers.and builders use but capable of a Variety of additional uses. This invention may be considered a further development of the hoists forming the subjects of my Patents No. 2,305,202, granted December 15, 1942; and No. 2,379,599 granted July 3, 1945.

Among objects of the present invention is the provision of cable guide means from the cable drum to the load to insure against the fouling of the cable with the hoist structure in hoist operation and to permit of the even winding of the cable upon the drum. A further object is to provide a traversing hoist having a power transmission including novel and simple means for materially increasing lift power over structures of conventional type familiar to me; and a hoist wherein the power in use automatically releases the brake during the lift ofthe load and with the power off the weight of the load automatically sets the brake thus providing safety in operation.

A further object is to provide a hoist with single control means for starting the motor and engaging the transmission clutch simultaneously and thereafter accelerating the motor and, conversely, that may be employed to decelerate motor speed and thereafter disengage the transmission clutch to provide aismooth stop, this operation being accomplished by the operator with the use of one handgonly. A still further object is to provide a traversingvhoist having a boom capable of easy swing through an arc of 190 degrees or more thus affording greater accessibility to all parts of the roof. Another object is to provide a traversing'hoist having a motor that is readily adjustablerto permit taking up slack in the operating-,sean changing the chain and sprocket drive tothe winch, and one wherein the motor is so suppprted as to be readily removed for repair, cleaning or renewal of parts as may be desiredrigAffurther object is to provide .a traversing hoist of compact assembly, of durable construction, 4that is inexpensive in operation, of well balancedf'setup, that may be readily partly dismantledto facilitate transport, storage etc. and wherein allI parts are accessible for inspection, adjustment and the like.

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 wherein like reference characters denote corresponding parts throughout.

In 'the drawings:

Fig. 1 is a side view of the instant hoist.

Fig. 2 is an enlarged detail View of the hoist showing the cable guide in plan.

Fig. 3 is a cross sectional view through Fig. 1 on the line 3-3, enlarged, an altered position of adjustable parts being denoted in dotted lines.

Fig. 4 is a vertical cross sectional view through Fig. 3 on the line 4 4.

Fig. 5 is a horizontal cross sectional view through Fig. 1 on the line 5-5.

Fig. 6 is an enlarged fragmentary plan view of Fig. 1, an interchangeable handle being denoted in dotted lines.

Fig. 7 is a View of Fig. 6 in side elevation.

Fig. 8 is a view 'in' elevational perspective of certain control mechanism, and, y A

Fig. 9 is a view in elevation and partly in section of the brake drum with brake band and brake band lever.

The reference numeral I0 denotes the jack substantially triangular in shape but with the base I I extending well beyond the sides I 2, I 3 and disposed preferably upon a 2 x 8 plank or the like, to which the base is secured by straps I5 to avoid otherwise possible lateral tilt in operation. Each side is provided with steel rod reinforcement I6 or the like for maximum strength. At approximately the longitudinal center of the jack and extending transversely and slightly forwardly thereof is the tubular brace I8 that supports the cam socket I9 forming .a bearing for the lower end of the lower side 20 of the swinging boom 2 I, the upper side 22 being received in a similar socket 23 in the apex of the jack, the cam sockets I9, 23 disposed in line with each other immediately forward but contiguous to the plane of the jack, said boom sides being connected by reinforcement structure 24 and at its forward end provided with the sheave 25. The boom is here so y supported as to have a swing through an arc of 35 free upon which is the brake drum 3B engaged sheave 25 at the forward end of the boom and provided at its end with the hook 45.

Referring again to the juxtaposed cable sheaves 44, 44 same are pivotally mounted to the spaced parallel studs 46, 46 connected by yoke 46a and carried by the bracket 41 pivotally connected by the pin 48 to the block 49 that freely but snugly receives the upper boom side 22 formed with three spaced perforations 50 to selectively receive the pin 5I to releasably secure said block in adjusted position upon said side, the block 49 being formed with the recess 52 to afford clearance for a reinforcement 24 in the forward position of block 49. Also secured to the block 49 and extending laterally from each side thereof is an arcuate stop 53 for engagement with the bracket 41 as same may swing from its full line position, Fig. 3, to either dotted line position.

The several perforations 50 in boom side 22 are located forwardly of a straight line 50a passing axially of the down-turned ends of the boom sides 20, 22 and the point of engagement of the cable 42 with the sheaves 44 so that the weight of the load upon hook 45 will assist in a lateral movement of theboom when such movement may be desired and initiated. Free upon the shaft 35 is a cog wheel 54, connected to said cable drum 4l and brake drum 36, in mesh with a pinion 55 keyed upon transmission shaft 56 carried by the frame, a collar 51 also keyed to shaft 56 is operable by lever 58 for movement of said pinion into and out of engagement with cog wheel 54, said lever fulcrumed to a brace 59 carried by the frame 33, said brace having secured thereto a stand 59a engaging one end of the contractile coil spring 66 connected to the said lever 38 yieldingly retaining same in position to very slightly and yieldingly engage the brake band with the drum. The brake cord 46 is adjustably secured to the jack so that the pull of the spring 60 may be set as desired and the wear of the band rendered negligible.

The brake is a one-way acting brake and when the motor drives the cable drum in a direction to take in the cable and hoist the load the action of the brake drum is to push the brakeband to a lesser gripping position and hence the band does not hold the drum against such winding or hoisting rotation. During the lowering operation the lever 58 is employed to move the collar 51 to disengage the pinion 55 from the cog wheel 54 thus freeing the drum 4I from its driving connection whereupon the drum would be under control of the brake cord 40 for rapid, yet controlled, lowering of the load. Secured to one end of the transmission shaft 56 is the cone 6| provided with the

sprocket wheels

62, 63, 64 of different sizes for connection selectively by the chain 65 to the

corresponding sprocket wheels

66, 61, 68 fast to the engine shaft 69 of the engine 16 provided with the handle 1l, said 4engine shaft adapted for engagement at one end by the crank 12 for cranking the motor when desired, said crank also adapted for engagement in like manner with the shaft 56. The teeth of the

sprocket wheels

66, 61, 68 are fewer in number than the teeth of the

sprocket wheels

62, 63, 64 of corresponding size thus slowing down the speed of shaft 56 relative to shaft 69 and increasing the lifting power. The motor assembly is secured to the tilting table 13 which is hinge-connected by the angular pin 14 to the frame 33, the table being connected at its opposite end by the bracket 15 and pivot pin 16 to the plunger 11 removably received in the cylindrical sleeve 18 and provided with a collar 19 adjustably secured thereto by set screw 80, said collar serving as a stop for arresting the movement of the plunger into the sleeve, said plunger also adapted for engagement by the angular lock screw 8l received in the threaded nose 62 of saidsleeve, said sleeve supported by the bracket 84 pivotally carried by the reinforcing structure 36. By loosening the screw 8| the table 13 with motor may be tilted upwardly and forwardly as denoted in dotted lines, Fig. '1, to slack the chain 65 to permit shifting the chain from one set of oppositely disposed sprocket wheels to another to vary the speed or to compensate for wear of the chain when necessary. Secured to one end of shaft 56 by the clutch collar 85 is one end of the throttle control lever 86 having the handle 81, said lever connected by link 88 and pins 89 to the bell crank 90 mounted to the casting 9| carried by supporting arm 92 connected to the frame, said bell crank connected by the flexible shaft 93 to the lever of the motor carburetor 94. By moving the lever 86 in one direction a certain distance the motor is. started through shaft 93 and the clutch thrown in thus operatively connecting the engine shaft 69 and shaft 56 and a further lever movement in the same direction will speed up the' motor;

What is claimed is:

1. In a traversing hoist, a mast having a stance at an angle to the perpendicular, a support for said mast including a truss bar and a bar connecting said mast and truss bar, a boom mounted to said mast to swing thereabout, sheave mechanism at one end of said boom, a winch carried by said support, juxtaposed sheaves carried by said boom adjacent said mast, and a cable about said winch passing between said sheaves and over said sheave mechanism.

2. In a traversing hoist, a mast having a stance at an angle to the perpendicular, a support for said mast including a truss bar and a bar connecting said mast and truss bar, cam sockets carried by said mast disposed in a straight line parallel to and forwardly of the plane of said mast, a boom journaled in said sockets, a sheave at one end of saidboom, juxtaposed sheaves carried by said boom adjacent said mast, stops for said sheaves carried by one of said cam sockets, a winch carried by said support and a cable about said winch passing between said juxtaposed sheaves and over said first named sheave.

' 3. In a traversing hoist, a mast, a truss bar supporting said mast, a swinging plurally perforated boom mounted ,to said mast, a sheave at one end of :said boom, guide sheaves carried by said' b'oom adjacent said mast, guide sheave mounting means carried by said boom, said means including a pin engageable in selected boom perforations to effect guide sleeve adjustment longitudinally of said boom, a winch carried by said truss bar, and a cable about said winch passing between said guide sheaves and over said first named sheave.

4L In a traversing hoist, a mast having a stance position of said sheaves.

at an angie to the perpendicular, a support for said mast including a truss bar and a bar connecting said mast and truss bar, cam sockets carried by said mast disposed in a straight line parallel to and forwardly of the plane of said mast, a swinging boom having downturned rear terminals journaled in said sockets, a sheave terminally carried by said boom, juxtaposed guide sheaves adustably carried by said boom adjacent said mast, a Winch carried by said support, and a cable about said Winch passingr between said sheaves and over said first named sheave, the point of Contact of said cable with said juxtaposed sheaves being in said straight line in one CHARLES R. SMITH.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED` STATES PATENTS Number Name Date 1,010,530 Taylor Dec. 5, 1911 1,367,142 Hills Feb. 1, 1921 1,433,016 Larsh Oct. 24, 1922 1,498,557 Liardet et a1. June 24, 1924 1,540,720 Buckbee June 2, 1925 2,237,944 Mauer Apr. 8, 1941 2,311,682 Murch Feb. 23, 1943 2,373,743 Cliiord Apr.17, 1945 2,488,920 Martin Nov. 22, 1949