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US2676052A - Power-operated hook - Google Patents

Power-operated hook Download PDF

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Publication number
US2676052A
US2676052A US108930A US10893049A US2676052A US 2676052 A US2676052 A US 2676052A US 108930 A US108930 A US 108930A US 10893049 A US10893049 A US 10893049A US 2676052 A US2676052 A US 2676052A
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Prior art keywords
jaws
cable
frame
pivotally connected
assembly
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Expired - Lifetime
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US108930A
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Jr Fouad K Mittry
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/14—Grabs opened or closed by driving motors thereon
    • B66C3/16—Grabs opened or closed by driving motors thereon by fluid motors

Definitions

  • This invention relates to power operated hooks, and more particularly to power operated hooks used in conjunction with cranes or other hoisting devices for grasping heavy loads such as concret laden dump buckets, baled scrap iron, etc.
  • Another object of my invention is to provide a power operated hook having a fast-acting, remotely-controlled pneumatic power unit for opening and closing the jaws.
  • a further object of my invention is to provide a power operated hook which is stable in operation and which will not become fouled or upset when the hook is disengaged from the load.
  • a further object of my invention is to provide a power operated hook which may be easily adapted to operate with any type of crane or other hoisting device.
  • Figure l is a general View in side elevation of a preferred form of device embodying my invention adapted to operate with a crane, and showing the jaws in opened position.
  • Figure 2 is a side elevation of a preferred form of my invention, the jaws closed.
  • Figure 3 is a sectional view of the jaw-overlapping device taken on the line 3-3 of Figure 2.
  • Figure 4 is a fragmentary sectional view, taken on the line 4-4, of the cable guard and frame pivot member.
  • FIG 1 a portion of a hoisting device is illustrated wherein lifting is achieved by means of a boom i, a cable 2 run through a sheave 3, and block 4.
  • the support cable 5 is suspended
  • Means are provided for attachmg the support cable 5 to the hook unit and, as shown in Figure 1, this means may include the cable anchor yoke 6.
  • Pivot means connecting the jaws 7 and I are provided and, as shown in the drawings, this means includes the pin 8, to which pin the cable anchor yoke 6 is secured.
  • the frame 9 is comprised of a short leg Ill and a long leg H, means being provided for their pivotal connection and, as shown in the drawings, this means includes the pin l2.
  • the short leg l0 likewise is pivotally connected to the jaw 1 at the pin 13 which is contained by the bracket is likewise connected to the l5 which is contained by the M.
  • Cable guide means are provided and, as illustrated in the drawings, this means may include the two pairs of rollers H and I 8 mounted for axial rotation on the support member I 9, which is secured to the long leg ll.
  • Rollers I! are opposed parallel members, as are rollers [8, so as to encompass the support cable 5.
  • Means are provided for the operable connec tion of the pneumatic power cylinder assembly to the frame 9 and jaws 'l and I and, as shown in the drawings, includes the air cylinder 20 pivotally connected to the leg I I by means of bracket 2
  • Operation of the pneumatic power cylinder assembly is effected by a four-way valve 26 mounted on a storage tank 32 and connected with the cylinder 20 by air lines 21 and 28.
  • the four-way valve 26 is actuated by the solenoid 29 mounted on the storage tank 32. Electric current for the solenoid 29 is supplied through the power line 30, the switch 40 preferably being located in the cab of the crane.
  • Air line 3! supplies air to the storage tank 32 secured to the leg I!) and which is connected with the valve 26 by means of air line 33.
  • Means are provided to prevent the opening of the jaws when subjected to a heavy load suspended therefrom.
  • this means includes the offsets 34 and 34 on the outer ends of jaws I and l respectively so that the free end of each jaw is received by the offset in the other.
  • Horizontal twisting of the hook is controlled by means of the bridl 35 and bridle cable 36 pivotally connected to the hook at the pin 8.
  • Bridle stops 3'! are provided on leg H in order to confine the vertical motion of the bridle.
  • a means of operating the air cylinder is illustrated in the drawings.
  • the solenoid 29 When the solenoid 29 is energized the armature 38 is retracted and the valve stem 39, which is secured to the armature 38, is thereby partially withdrawn. This allows air to flow from the supply tank 32 through air line 33, the four-way valve 26 and thence through air line 21 into cylinder 20, extending the piston rod 23, thereby causing the jaws I and 'I' to open as described above.
  • the exhaust air passes through air line 28 to the valve 25 and is vented from a port (not shown).
  • the armature 38 is ejected by means of a spring (not shown), retracting the valve stem 39. This reverses the flow of air through air lines 21 and 28, causing the piston rod to be retracted, closing the jaws I and 1.
  • my invention provides (inter alia) for quick opening and closing of the jaws due to the arrangement of the four-way valve in close proximity to the air cylinder.
  • the problem of time lag caused by long air feed lines is obviated by use of the electrically-operated four-way valve arrangement as described above.
  • a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encompass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an upright position, a pneumatic power cylinder assembly operably connected at one end 'to said frame and at the other end to said jaw assembly, a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
  • a pivoted jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of said jaws being offset so as to form an overlap between the jaws when in the closed position
  • a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a pneumatic power cylinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
  • a pivoted jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of said jaws being offset so as to form an overlap between the jaws when in the closed position
  • a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encompass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an a pneumatic power cylinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
  • a pivoted jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the ends of said jaws being offset so as to form an overlap between the jaws when in the closed position
  • a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encoinpass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an upright position
  • a pneumatic power cylinder assembly operably connected at one end to said frame and at the other end to said jaw assembly
  • a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, means for actuating the four-way valve mechanism comprising a solenoid positioned in close proximity thereto, and means including a remotely
  • a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of said jaws being offset so'as to form an overlap between the jaws when in the closed position, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a pneumatic power cylinder comprised of a cylinder member and a piston member, one of said members being pivotally connected to said frame and the other member being pivotally connected to said jaw assembly, a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
  • a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the ends of said jaws being offset so as to form an overlap between the jaws when in the closed position
  • a frame comprising a pair of legs pivotally connected together, each leg be ing pivotally connected to one of said jaws at a position intermediate the pivot and outer end of said jaws
  • a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable
  • a pneumatic power cylinder comprised of a cylinder member and a piston member, one of said members being pivotally connected to said frame and the other member being pivotally connected to said jaw assembly
  • a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and'means toupright position
  • a jaw assembly comprising. a. pair of jaws and pivot means connecting the jaws, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws at a position intermediate the pivot and outer ends of said jaws, a cable anchor yoke connected to said pivot means, means on said yokes for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encompass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an upright position, a pneumatic power clyinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a fourway valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, means for actuating the four-way valve mechanism comprising a solenoid positioned in close proximity thereto, and means including a remotely extending electric cable for actuating the sole
  • a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of form an overlap between the jaws when in the closed position, a frame comprising a long leg and a short leg pivotally connected together, each leg being pivotally connected at one of said jaws at a position intermediate the pivot and outer ends of said jaws, a cable anchor yoke connected to said pivot means, a supporting cable anchored said jaws being offset so as to in said cable anchor yoke, a cable guide comprised of a plurality of rollers arranged to encompass the said cable and positioned on the said long leg above the jaw assembly whereby the jaw assembly is maintained in an upright position, a bridle operably connected to said pivot means, a pneumatic power cylinder comprised of a cylinder member and a piston member, one of said members being connected to said long leg and the other member being pivotally connected to one of said jaws intermediate the pivot and outer ends thereof, a four-way valve mechanism mounted on

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Description

April 20, 1954 F. K. MITTRY, JR
POWER-OPERATED HOOK Filed Aug. 6, 1949 l I l I .A a 54l 54 INVENTOR.
FOO/70 16. 44/7789, J2.
Patented Apr. 20, 1954 UNITED STATES PATENT OFFICE 8 Claims.
This invention relates to power operated hooks, and more particularly to power operated hooks used in conjunction with cranes or other hoisting devices for grasping heavy loads such as concret laden dump buckets, baled scrap iron, etc.
of the objects of my invention is to provide a power operated hook, the jaws of which are capable of lifting great Weights without danger of the load causing the jaws to open.
Another object of my invention is to provide a power operated hook having a fast-acting, remotely-controlled pneumatic power unit for opening and closing the jaws.
A further object of my invention is to provide a power operated hook which is stable in operation and which will not become fouled or upset when the hook is disengaged from the load.
A further object of my invention is to provide a power operated hook which may be easily adapted to operate with any type of crane or other hoisting device.
Other objects and advantages of my invention will appear hereinafter in the detailed description thereof in connection with the accompanying drawings.
In the drawings:
Figure l is a general View in side elevation of a preferred form of device embodying my invention adapted to operate with a crane, and showing the jaws in opened position.
Figure 2 is a side elevation of a preferred form of my invention, the jaws closed.
Figure 3 is a sectional view of the jaw-overlapping device taken on the line 3-3 of Figure 2.
Figure 4 is a fragmentary sectional view, taken on the line 4-4, of the cable guard and frame pivot member.
In Figure 1, a portion of a hoisting device is illustrated wherein lifting is achieved by means of a boom i, a cable 2 run through a sheave 3, and block 4. The support cable 5 is suspended Means are provided for attachmg the support cable 5 to the hook unit and, as shown in Figure 1, this means may include the cable anchor yoke 6.
Pivot means connecting the jaws 7 and I are provided and, as shown in the drawings, this means includes the pin 8, to which pin the cable anchor yoke 6 is secured.
The frame 9 is comprised of a short leg Ill and a long leg H, means being provided for their pivotal connection and, as shown in the drawings, this means includes the pin l2. The short leg l0 likewise is pivotally connected to the jaw 1 at the pin 13 which is contained by the bracket is likewise connected to the l5 which is contained by the M. The long leg jaw 7 at the pin bracket l6.
Cable guide means are provided and, as illustrated in the drawings, this means may include the two pairs of rollers H and I 8 mounted for axial rotation on the support member I 9, which is secured to the long leg ll. Rollers I! are opposed parallel members, as are rollers [8, so as to encompass the support cable 5.
Means are provided for the operable connec tion of the pneumatic power cylinder assembly to the frame 9 and jaws 'l and I and, as shown in the drawings, includes the air cylinder 20 pivotally connected to the leg I I by means of bracket 2| andL the pin 22, and the piston rod 23 pivotally connected to the jaw 1' by means of bracket 24 and pin 25.
Operation of the pneumatic power cylinder assembly is effected by a four-way valve 26 mounted on a storage tank 32 and connected with the cylinder 20 by air lines 21 and 28. The four-way valve 26 is actuated by the solenoid 29 mounted on the storage tank 32. Electric current for the solenoid 29 is supplied through the power line 30, the switch 40 preferably being located in the cab of the crane. Air line 3! supplies air to the storage tank 32 secured to the leg I!) and which is connected with the valve 26 by means of air line 33.
Means are provided to prevent the opening of the jaws when subjected to a heavy load suspended therefrom. As shown in the drawings, and more particularly in Figure 3, this means includes the offsets 34 and 34 on the outer ends of jaws I and l respectively so that the free end of each jaw is received by the offset in the other. Horizontal twisting of the hook is controlled by means of the bridl 35 and bridle cable 36 pivotally connected to the hook at the pin 8. Bridle stops 3'! are provided on leg H in order to confine the vertical motion of the bridle.
As seen in Figure 2, when the piston rod 23 is retracted into the cylinder 20, the jaws are in closed or carrying position. Extension of the piston rod 23 causes relative separation of the pivot pins 8 and I2, bringing about through the action of legs 9 and Hi, the opening of the jaws.
A means of operating the air cylinder is illustrated in the drawings. When the solenoid 29 is energized the armature 38 is retracted and the valve stem 39, which is secured to the armature 38, is thereby partially withdrawn. This allows air to flow from the supply tank 32 through air line 33, the four-way valve 26 and thence through air line 21 into cylinder 20, extending the piston rod 23, thereby causing the jaws I and 'I' to open as described above.
The exhaust air passes through air line 28 to the valve 25 and is vented from a port (not shown). When the electric circuit is opened and the solenoid de-energized, the armature 38 is ejected by means of a spring (not shown), retracting the valve stem 39. This reverses the flow of air through air lines 21 and 28, causing the piston rod to be retracted, closing the jaws I and 1.
It will be noted that my invention provides (inter alia) for quick opening and closing of the jaws due to the arrangement of the four-way valve in close proximity to the air cylinder. The problem of time lag caused by long air feed lines is obviated by use of the electrically-operated four-way valve arrangement as described above.
While I have shown only a preferred form of my invention, it should be understood that various changes and modifications may be made without departing from the spirit of the invention.
I claim:
1. In a lifting hook of the cable-supported type, the combination of a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encompass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an upright position, a pneumatic power cylinder assembly operably connected at one end 'to said frame and at the other end to said jaw assembly, a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
2. In a lifting hook of the cable-supported type, the combination of a pivoted jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of said jaws being offset so as to form an overlap between the jaws when in the closed position, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a pneumatic power cylinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
3. In a lifting hook of the cable-supported type, the combination of a pivoted jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of said jaws being offset so as to form an overlap between the jaws when in the closed position, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encompass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an a pneumatic power cylinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
4. In a lifting hook of the cable-supported type, the combination of a pivoted jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the ends of said jaws being offset so as to form an overlap between the jaws when in the closed position, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encoinpass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an upright position, a pneumatic power cylinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, means for actuating the four-way valve mechanism comprising a solenoid positioned in close proximity thereto, and means including a remotely extending electric cable for actuating the solenoid.
5. In a lifting hook of the cable-supported type, the combination of a jaw assembly compris ing a pair of jaws and pivot means connecting the jaws, the outer ends of said jaws being offset so'as to form an overlap between the jaws when in the closed position, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a pneumatic power cylinder comprised of a cylinder member and a piston member, one of said members being pivotally connected to said frame and the other member being pivotally connected to said jaw assembly, a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and means to supply pneumatic pressure to said valve assembly.
6. In a lifting hook of the cable-supported type, the combination of a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the ends of said jaws being offset so as to form an overlap between the jaws when in the closed position, a frame comprising a pair of legs pivotally connected together, each leg be ing pivotally connected to one of said jaws at a position intermediate the pivot and outer end of said jaws, a cable anchor yoke connected to said pivot means, means on said yoke for anchoring the cable, a pneumatic power cylinder comprised of a cylinder member and a piston member, one of said members being pivotally connected to said frame and the other member being pivotally connected to said jaw assembly, a four-way valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, and'means toupright position,
supply pneumatic pressure to. said valve assembly. 7
'7. In a lifting hook of the cable-supported type, the combination of a jaw assembly comprising. a. pair of jaws and pivot means connecting the jaws, a frame comprising a pair of legs pivotally connected together, each leg being pivotally connected to one of said jaws at a position intermediate the pivot and outer ends of said jaws, a cable anchor yoke connected to said pivot means, means on said yokes for anchoring the cable, a cable guide comprised of a plurality of rollers arranged to encompass the cable and positioned above the jaw assembly and said yoke whereby the jaw assembly is maintained in an upright position, a pneumatic power clyinder assembly operably connected at one end to said frame and at the other end to said jaw assembly, a fourway valve mechanism mounted on the frame, means for connecting the valve for control of the operation of said power cylinder assembly, means for actuating the four-way valve mechanism comprising a solenoid positioned in close proximity thereto, and means including a remotely extending electric cable for actuating the solenoid.
8. In a lifting hook of the class described, the combination of a jaw assembly comprising a pair of jaws and pivot means connecting the jaws, the outer ends of form an overlap between the jaws when in the closed position, a frame comprising a long leg and a short leg pivotally connected together, each leg being pivotally connected at one of said jaws at a position intermediate the pivot and outer ends of said jaws, a cable anchor yoke connected to said pivot means, a supporting cable anchored said jaws being offset so as to in said cable anchor yoke, a cable guide comprised of a plurality of rollers arranged to encompass the said cable and positioned on the said long leg above the jaw assembly whereby the jaw assembly is maintained in an upright position, a bridle operably connected to said pivot means, a pneumatic power cylinder comprised of a cylinder member and a piston member, one of said members being connected to said long leg and the other member being pivotally connected to one of said jaws intermediate the pivot and outer ends thereof, a four-way valve mechanism mounted on the frame and connected to control the operation of said power cylinder assembly, means for actuating the four-way valve mechanism comprising a solenoid positioned in close proximity thereto, and means including a remotely extending electric cable for actuating the solenoid.
References Cited in the file of this patent UNITED STATES PATENTS
US108930A 1949-08-06 1949-08-06 Power-operated hook Expired - Lifetime US2676052A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732248A (en) * 1953-05-27 1956-01-24 Lifting device
US2787390A (en) * 1954-07-02 1957-04-02 Roaland H Lloyd Clam shell loader
US2821377A (en) * 1956-04-04 1958-01-28 Pennsylvania Engineering Corp Vessel charging apparatus
US2894780A (en) * 1955-09-23 1959-07-14 Presray Corp Material handling apparatus
DE1113077B (en) * 1957-03-11 1961-08-24 Wilhelm Scheidt Maschinenfabri Sink grab
US3545237A (en) * 1968-09-26 1970-12-08 Verne P Thompson Power activated manacle
US4381872A (en) * 1981-03-26 1983-05-03 Mcginnes Manufacturing Company Remote controlled clamshell bucket apparatus and method of using same
US11041283B2 (en) * 2017-05-03 2021-06-22 Liebherr-Werk Nenzing Gmbh Slurry wall grab having a hybrid drive

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US247829A (en) * 1881-10-04 And ge
US925018A (en) * 1908-06-25 1909-06-15 Mcmyler Mfg Company Clam-shell bucket.
US1988135A (en) * 1931-12-31 1935-01-15 Ogden R Odman Rock handling device
US2136890A (en) * 1937-12-13 1938-11-15 Joel M Roberts Excavating bucket
US2188672A (en) * 1938-06-06 1940-01-30 Hayward Co Grab bucket
US2334181A (en) * 1942-01-14 1943-11-16 Highway Safety Appliances Inc Valve for road sanding machines
US2386006A (en) * 1943-09-09 1945-10-02 New York Air Brake Co Sander
US2412845A (en) * 1945-06-09 1946-12-17 Arthur M Stevens Grapple fork

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US247829A (en) * 1881-10-04 And ge
US925018A (en) * 1908-06-25 1909-06-15 Mcmyler Mfg Company Clam-shell bucket.
US1988135A (en) * 1931-12-31 1935-01-15 Ogden R Odman Rock handling device
US2136890A (en) * 1937-12-13 1938-11-15 Joel M Roberts Excavating bucket
US2188672A (en) * 1938-06-06 1940-01-30 Hayward Co Grab bucket
US2334181A (en) * 1942-01-14 1943-11-16 Highway Safety Appliances Inc Valve for road sanding machines
US2386006A (en) * 1943-09-09 1945-10-02 New York Air Brake Co Sander
US2412845A (en) * 1945-06-09 1946-12-17 Arthur M Stevens Grapple fork

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732248A (en) * 1953-05-27 1956-01-24 Lifting device
US2787390A (en) * 1954-07-02 1957-04-02 Roaland H Lloyd Clam shell loader
US2894780A (en) * 1955-09-23 1959-07-14 Presray Corp Material handling apparatus
US2821377A (en) * 1956-04-04 1958-01-28 Pennsylvania Engineering Corp Vessel charging apparatus
DE1113077B (en) * 1957-03-11 1961-08-24 Wilhelm Scheidt Maschinenfabri Sink grab
US3545237A (en) * 1968-09-26 1970-12-08 Verne P Thompson Power activated manacle
US4381872A (en) * 1981-03-26 1983-05-03 Mcginnes Manufacturing Company Remote controlled clamshell bucket apparatus and method of using same
US11041283B2 (en) * 2017-05-03 2021-06-22 Liebherr-Werk Nenzing Gmbh Slurry wall grab having a hybrid drive

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