US1907436A - Hoisting block - Google Patents

Description

May 9, 1933. M NlEMl 1,907,436

HOISTING BLOCK Filed Feb. l5, 1932 Patented May 9, 1933 were@ r oFFicr:

MATTI NIEIVII, OF SEATTLE, WASHINGTON' noIsTING BLOCKv I I Application led February 15, 1932. Serial No. 593,033.

This invention relates to hoisting blocks, andy more especially to improvements over structure illustrated and described in my copending application, SerialNumber 57 3,912.

The present invention utilizing, as with my prior invention, a pair of wedge-closing jaws, the wedge being actuated by a spring, an object of the present invention is the provision of a most advantageous arrangement of lock plungers preventing accidental wedge'retraction. *Y

A further object is the provision, co-oper ative with'said lock, of a safety release therefor so designed that the locking plungers are fully retracted prior to wedge movement.

The foregoing, together with further and more particular objects and advantages, such as have reference to details of construction in affording most eiiicient action, strength and durability of the component parts, should become apparent in the course of the following detailed description 'and claims, the invention consisting yin the novel construction, adaptation and combination of parts hereinafter described and claimed.

VIn the drawing V Figure 1 is a longitudinal vertical section, parts being indicated in side elevation, of my improved block'. .j n s o Figure 2 is a transverse vertical section thereof, taken on the line 2-2 ofFigure 1."

' yFigure 3 is Yan enlarged detail longitudinal vsection illustrating 'one of the ,companionl locking pins; vand p Figure a is a detail transverse vertical section, taken to an enlarged scale, of the control mechanism for said pins. s 4

Reference had thereto, the present invention, as with my aforementioned hoisting block, includes a housing conformed of a medial generally horse shoe 'configured member 5 adapted for interposition between cooperating closure. plates 6, 7, being joined thereto by bolts 8. As indicated, the ,inner side walls of said member '5 are plane, convergingdirectively of Vone another from a head wall 9 to a throat 10. "At opposite sides of a transverseV vertical center line taken through said throatiarea pair of laterally spaced-apart fulcrum pins 11 serving to support mediallyof'their lengths, a pair of levers 12 having their upper terminal or power arms l3normally' seating against the member 5, the work arms below said fulcruins` providing companion jaws 14. 15 indicates springs in- 5 troduced in sockets of the power arms for spreading the jaws, said springs retained in associated socketsl of the'vmember by means ofplugsl.VV Said inner faces of the power arms being parallel or nearly so with the outer seating surfaces and providing a recession 17 adjacent terminal ends of the same, upper portionsl of suchV recesses receiving rollers 18, the invention introduces a vertically-movable wedge member 19 inrthe spacebetween said Varms for tracking engagement of its sidewalls 21 over said rollers, saidv wedge normally seating against 'a shoulder 20 formed relatively adjacent the leverfulcrums 11. The tracking walls yof said wedge recede inwardly in accommodating the movement of the lever power arms about their respectivefulcrum. Awedge guide comprises a transverse pin 22 acting in a slotl 23 of the wedge to co-operate with` a bolt 24 securedto thewedge. Said bolt, receiving a spring 25 thereabouts for influencing the wedge against the lever power arms, projects through the head-wall 9 and terminates in an eye 26, said eye having parallel side armsadapted to receive a slide member formed of a centerguide 27 riveted or otherwise secured betweenyplates 28 con- A formedto overlap the eye. A ring or the like 30 connects said slide with a release lineV 31. The larrangement allows relative vertical activity of the slide prior to an abutting engagement of the same with Athe upper cross arm ofthe eye. Secured to said slide through suitable means, the arrangement shown being a soldered head 32 engaging laterally turned out wings 33 of the slide side plates 28, are cables 31projecting through apertures of the housing head, said cables passing about rollers 3.5 supported in a verticallybored recess of the wedge and through center bores of a respective horizontally v'movable lock plunger 36 for connection therewith. The cylinder bore for said plungers provides a shoulder 37' accommodating the introduction of a spring 38 rearwardly of the plunger, said cylinder located to normally dispose the plunger for socketed engagement below the lever-supported rollers 18.

40 indicates a bail for elevating or lowering the housing, being mounted between brackets 42 andthe housing side plates on supporting trunnions 43.

I have represented the jaws as adapted to the engagement of a work-supporting ring 44. A designing of the same, however, to accommodate the various characters ofwork is believed obvious. structure disclosed, the' lock plungers normally engage inthe lever power arm recesses below the rollers, preventing wedge` retraction.Y In releasing the same, the slide is actuated `to extract the plungers, such being fully` disengaged prior to- Contact of the center guide 2r against the eye with wedgemovement. i Y

Various vmodifications within the scope of the invention are believedobvious.

What I claim is: Y

Al. Inahoist-ing block, a chambered housing having a throat communicatingzwith the chamber thereof at the lower end of the same, an elevating bail for said housing, a pair of horizontally spaced pivot pinssupported by said housing to locate thek same at opposite sides of a transverse center line'taken through .said throat, levers fulcrumed ,onv said pins to provide companion jaws at their lower ends and power arms projecting; within the chamber, a wedge supported in the space between said power `arms within said chamber, a spring serving to inuence said wedge to spread the power arms in closing said jaws, rollers supported by said power arms for riding engagement lwith saidt Wedge, means for retracting said wedge in opposition to the spring, and springs socketed rearwardly of each of said power arms for opening the jaws responsive to said wedge retraction.

2. The structure as defined in claim l', including lock plungers `engageable between said power arms and the wedge for preventing accidental retraction of said wedge.

y VIn hoisting apparatus, al blockhaving a bail attached thereto for elevating the same, a pairiof horizontally'spaced pivot pins supported by said block, levers fulcrumcd on said pins to provide companion aws 'at their ,lower ends and power arms at their upper ends, a wedge engageable with said power arms and supported for movement therebetween, a spring serving to influence said subsequent wedge to spread said power arms in closing the jaws, said power arms providing sock-ets in respective inner faces of the same, aroller .supported in the upper portions of each Aof said sockets'for tracking engagement with the wedge, lock plungers supported by said wedge for horizontal movement into and In the operation of the.

from the sockets below said rollers for locking and releasing the wedge with respect to the levers, springs for influencing said plungers into the sockets, and means for releasing said plungers from their locking dispositions co-incident with retraction of the wedge.

4. The structure as deiined in claim, said plungers being fully released prio-r to transmission of retraction power to the wedge.

5. In a hoisting block, a pair of lever members ulcrumed for movement about a respective horizontal axis, said axes horizontally spaced, one from the other', said levers being Aformed to. provide work-engaging jaws below and diverging power arms above the horizontal plane of the fulcrums, a wedge supported for movement between said power arms,p lungers adapted .to normally interconnect said wedge and the power arms for Vlocking the same vagainst movement, and

means for releasing said plungers and for retracting said wedge, said means being inoperative to the wedge prior to full disengagement of the plungers.

6. In grapplingv structure, a pair of lever members supported to provide work-engaging and power arms belowand above the point of pivotal suspension, said power arms diverging upwardly from one another, a wedge engageable between: said power arms, means for normally looking said wedge with respect to the power arms to retain the workengaging arms in operative dispositions, and means for releasing said lock and for retracting said-wedge, said release means being inoperative with respectv to the wedge prior tofull release oit' the lock.

,Y 7. In grappling structure', levers collectively providing work-engaging arms, a wedge engageable with said levers-for closing the arms, springs engageable with the levers foropening said jaws responsive to wedge retraction, and releasable means -for locking said wedge and levers to normally maintain said arms `in their work-engaging dispositions. f Y

8. The combination with a movable member, a track way therefor, said track including rollers supported at opposite sides of Ysaid member, of means for locking said memher against movement, said means comprising plungers movable at cross angles tothe direction of member movement and supported for engagement below the rollers,

Vsprings serving to influence said plungers into engaging relation, and means for retractmg said plungers 1n opposition to said 1 springs.

9. The structure as delined in claim 8 including means for moving said member, said means being inoperative with respect to thc member prior to full retraction of the plungers.

'10. The combination with a slidabley member, and means for locking the same` against movement, of means for releasing said lock and for moving said member, said means being inoperative with respect to the member prior to disengagement of the lock.

l1. In grappling structure, levers collectively providing work-engaging jaws, a Wedge engageable with said levers for closing the same, lock means for preventing movement of said Wedge from its jaw-closing disposition, means for releasing said lock, and means for retracting said Wedge.

Signed at Seattle, Washington, this 25 day of November 1931.

MATTI NIEMI.

Images