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Drywall mud pump for pumping drywall joint compound, for instance, from a bucket into a drywall tool. The pump includes a cylinder, a piston, a rod, and a means, or a connection structure between the piston and the rod, for allowing the end of the rod to move laterally relative to the piston. Some e

Drywall mud pump for pumping drywall joint compound, for instance, from a bucket into a drywall tool. The pump includes a cylinder, a piston, a rod, and a means, or a connection structure between the piston and the rod, for allowing the end of the rod to move laterally relative to the piston. Some embodiments have an elongated hole in the piston that receives a flattened or reduced diameter end of the rod, for example. Different embodiments include a pump head through which the rod passes, a handle, a linkage, a means for allowing the rod to pivot, a shortened guide, a means for preventing the piston from rotating about the rod, or a combination thereof. Pistons may include, for example, passageways with straight and curved sides, a flapper, an elongated washer to block the elongated hole, and a means for controlling the rotational position of the washer.

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1. An assemblable drywall mud pump, wherein, when the drywall mud pump is assembled, the drywall mud pump comprises: a main cylinder;a rod having a first end and a second end, wherein the second end is located within the main cylinder; anda piston located within the main cylinder and attached to the

1. An assemblable drywall mud pump, wherein, when the drywall mud pump is assembled, the drywall mud pump comprises: a main cylinder;a rod having a first end and a second end, wherein the second end is located within the main cylinder; anda piston located within the main cylinder and attached to the rod,wherein the piston comprises an elongated hole that receives the second end of the rod,wherein the elongated hole allows the second end of the rod to move laterally relative to the piston, andwherein the piston comprises an elastomeric piston cup having a first elongated hole, a top rigid support having a second elongated hole, a bottom rigid support having a third elongated hole, and a flapper valve having a fourth elongated hole. 2. The assemblable drywall mud pump of claim 1, wherein the second end of the rod passes through each of the first, second, third, and fourth elongated holes. 3. The assemblable drywall mud pump of claim 1, wherein the second end of the rod has a flattened portion, and wherein at least the second and third elongated holes are substantially the same size, have substantially the same shape, and are held in a particular orientation by the flattened portion of the second end of the rod. 4. The assemblable drywall mud pump of claim 1, further comprising a pump head, wherein the piston cup, the top rigid support, and the bottom rigid support each have at least one passageway therethrough for passage of the drywall mud, wherein the flapper valve covers the at least one passageway, substantially blocking passage of the drywall mud when the piston is moving in the main cylinder toward the pump head. 5. The assemblable drywall mud pump of claim 1, wherein the piston cup, the top rigid support, and the bottom rigid support each have multiple passageways therethrough for passage of drywall mud, wherein the multiple passageways substantially surround the first, second, and third elongated holes, and wherein a plurality of the multiple passageways for passage of drywall mud have at least one curved side and at least one straight side. 6. The assemblable drywall mud pump of claim 1, further comprising: a pump head having an output aperture, wherein the pump head is connected to the main cylinder and the rod passes through the pump head; anda handle and a linkage, wherein the handle is pivotably connected to the first end of the rod, and the linkage is pivotably connected to the pump head and pivotably connected to the handle. 7. The assemblable drywall mud pump of claim 1, further comprising a pump head, wherein the pump head is connected to the main cylinder, and wherein the rod passes through the pump head. 8. The assemblable drywall mud pump of claim 7, wherein the pump head allows the rod to pivot as the second end of the rod moves laterally relative to the piston. 9. The assemblable drywall mud pump of claim 1, further comprising a pump head, wherein the pump head is connected to the main cylinder, wherein the rod passes through the pump head,wherein the pump head comprises a single shortened guide having a hole through which the rod slidably passes, andwherein the guide serves as a pivot point for the rod. 10. An assemblable drywall mud pump, wherein, when the drywall mud pump is assembled, the drywall mud pump comprises: a main cylinder;a rod having a first end and a second end, wherein the second end is located within the main cylinder; anda piston located within the main cylinder and attached to the rod,wherein the piston comprises an elongated hole that receives the second end of the rod,wherein the elongated hole allows the second end of the rod to move laterally relative to the piston, andwherein the second end of the rod is attached to the piston with a lock nut and an elongated washer. 11. An assemblable drywall mud pump, wherein, when the drywall mud pump is assembled, the drywall mud pump comprises: a main cylinder;a rod having a first end and a second end, wherein the second end is located within the main cylinder;a piston located within the main cylinder and attached to the rod, wherein the piston comprises an elongated hole that receives the second end of the rod, and wherein the elongated hole allows the second end of the rod to move laterally relative to the piston; andan elongated washer, wherein the washer substantially blocks the elongated hole in the piston to prevent drywall mud from passing through the elongated hole in the piston, and wherein the drywall mud pump comprises a means for controlling the rotational position of the washer. 12. An assemblable drywall mud pump, wherein, when the drywall mud pump is assembled, the drywall mud pump comprises: a main cylinder;a rod having a first end and a second end, wherein the second end is located within the main cylinder; anda piston located within the main cylinder and attached to the rod,wherein the piston comprises an elongated hole that receives the second end of the rod,wherein the elongated hole allows the second end of the rod to move laterally relative to the piston, andwherein the second end of the rod includes a first reduced diameter flattened section and a second reduced diameter flattened section, wherein the second reduced diameter flattened section has a smaller diameter and thickness between flats than the first reduced diameter flattened section, and wherein the second end of the rod also includes a threaded section. 13. The assemblable drywall mud pump of claim 12, wherein the piston comprises a flexible piston cup having a first elongated hole, a top rigid support having a second elongated hole, a bottom rigid support having a third elongated hole, and a flapper valve having a fourth elongated hole, wherein the second end of the rod passes through each of the first, second, third, and fourth elongated holes such that the fourth elongated hole is located at the first reduced diameter flattened section, and the first, second and third elongated holes are located at the second reduced diameter flattened section, and wherein the second end of the rod is attached to the piston with a nut located on the threaded section of the rod.