US1389814A

US1389814A - Weight-lifting device

Info

Publication number: US1389814A
Application number: US308509A
Authority: US
Inventors: Earle E Chapman
Original assignee: EARLE-CHAPMAN COMP
Current assignee: ?MAN Co; EARLE-CHAPMAN COMP
Priority date: 1920-06-28
Filing date: 1920-06-28
Publication date: 1921-09-06
Anticipated expiration: 1938-09-06

Description

E. E. CHAPMAN. WEIGHT LIFTING DEVICE APPLICATION FILED JUNE 23,1920,

Q ma li. CHAPMAN. WEIGHT LIFHNG DEV-HIE, PL]

E. E. CHAPMAN. WEIGHT LIFTING DEVICE. APPLICATION FILED JUN thus be seen that by an alternate up and down movement that the whole device is advanced one link of the chain 11, the suspension member 19 being raised a distance equal to the length of one pair of links of the chain 11. To raise this hook this small amount, the operator must exert a force over considerable distance both up and down. If it is desired to continue the movement, the operation just described is repeated as many times as desired.

It will be noted that by the use of the fin er 31 and the cam 40 that the outward an inward movement of the hooks is entirely automatic, these hooks moving out of engagement with the chain 11 and back into engagement following the lines of the cam 40. ,With the parts in the position shown in full lines in Fig. 1, if it is desired to lower the weight, the operator pushes upwardly on the pipe 60 moving the parts into the position shown in Fig. 3. It will be noted that in this figure the hook 12 is raised out of engagement with the link 65 and it will be further noted that the finger 31 is moved up into a position where it can snap over and engage the lifting cam 42, the spring 32 forcing it over against the side bar 14 of the hook 13. If new the operator allows the pipe 60 to go downwardly by releasing his pressure thereon, the book 12 is thrown outwardly by the cam 42 so that it clears the link 65 on its downward path, this hook moving downwardly until it resumes the position shown in Fig. 2. At the middle of its travel, the finger 31 reaches the inclined portion 43 of the cam 42 and the pressure of the spring 26 forces this finger downwardly against the cam 41 upon which the finger thereafter travels thus allowing the hook 12 to move inwardly sufiiciently to engage the link 70. The operator then pushes downwardly on the pipe lifting the hook 13 into the position shown in Fig. 4 which is out of engagement with the link 64, the finger 31 being then in a position to engage the lower end of the lowering cam. 42. By diminishing his pressure on the lever 60 the operator can now'a low the load to fall, the hook 13 being thrown out of the path 64 as it moves downwardly. As it reaches its central position the finger 31 reaches the interrupted portion 43 of the cam 42 and the spring 26 forces the finger inwardly against the cam 41 upon which it then travels. This allows the finger 13 to engage the link 65'.

During the movements just described, the weight is lowered the length of one pair of links if" the chain and this lowering move ment may be repeated as many times as desired by repeating the cycle of operation just described. It is thus possible for. an,

operator to either raise or lower the weight without in-any way changing the device or upon the lowering cam and the weight may be lowered. In practice the operation of the device is very, rapid and is extremely sure, the method of operation being readily learned and understood by anyone.

I claim as my invention:

1. A weight lifting device comprising a suspended member having projections thereon, a lever to which the weight to be lifted is attached, two hooks pivoted to said lever on opposite sides of the attachment point of said weight, said hooks engaging the projections on said suspended member from opposite sides, spring means for forcing said hooks toward each other, and cam means for forcing saidhooks apart to disengage them from said suspended member.

2. A weight lifting device comprising a suspended member having projections thereon, a lever to which the weight to be lifted is attached, two hooks pivoted to said lever on opposite sides of the attachment point of said weight, said hooks engaging the proj ections on said suspended member from opposite sides, and means for causing said hooks td engage and disengage said irregularities.

3. A weight lifting device comprising a suspended member having projections thereon, a lever to which the weight to be lifted is attached, two hooks pivoted to said lever on opposite sides of the attachment point of said weight, said hooks enga ing the projections on said suspended mem r from opposite sides, spring means for forcing said hooks toward each other, a finger secured to one of said hooks, and a cam secured to the other hook, said finger pressing against said cam which is so shaped as to force said finger to separate said hooks as it slides over said cam.

4. A weight lifting device comprising a suspended member having projections thereon, a lever to which the weight to be lifted is attached, two hooks pivoted to said lever on opposite sides of the attachment point of said weight, said hooks engaging the pro jections on said suspended member from opposite sides, spring means for forcing said hooks toward each other, and means for throwing each of said hooks away from said member as it is lifted by a movement of saiii lever about the pivot point of the other book 5. A weight lifting device comprising a suspended member having projections thereon, a lever to which the weight to be lifted it attached, two hooks pivoted to said lever means 501* forcing said bffSfi-ld linger and so formeqi tothrow said 7 i100 s alternately out/01". the engagement memwith said projeciions sis/said hbeks areliiee. nvei ezi by a meveinenfi said withou" preventing hacks frem engage vei; poi'ni; 0f the oti r 13003;. ing said projecsions as they are ieweied. 6. A Wei 1i; f i device eompiising a 8. A weight iii zilig device comprising 3E5 suspended member having proj e time there suspended member having projections 'heieon, a lever which die Weight to be 11*" 021, a lever to which the Weight to be iifteri is is abfiacheci, We hacks pivoted be said leve s'stached, two hoe pimter} 1'10 said lever on 19' mini: 0" epposi'ze sides e said Weig agile said s ngagement member saiei lever MG '7. A WEiQ'ht ii. sus ended mam 021 a iever to which 1 1 said projee'tiens said b005, ii-s.-Ci em; preventing said oaks from aid projections as t lowering en fo med a hey lowered and 7 by said. finger and so 59 said hooks from enis attached, two hacks ctiotns when at 0'1" on apposite SZCiQS of l i