| Patent Number |
Title Of Patent |
Date Issued |
| 5782621 |
Manual pump with inherent vacuum limit |
July 21, 1998 |
| A vacuum pump useful in penile erection systems is provided. The vacuum pump comprises a piston in a cylinder with intake and exhaust valves. The vacuum producing outstroke is powered by a spring having sufficient force to draw a vacuum no higher than the desired upper safety limit, and |
| 5009548 |
Apparatus for and a method of facilitating the excavating and refilling of a trench |
April 23, 1991 |
| A method of excavating a trench (60) wherein lateral confinement such as walls, trenches, vehicular traffic, and the like prevent the accumulation of soil in the confined areas adjacent to the trench (60) and an apparatus for the same. The apparatus (10) consists of a double section belt |
| 4762242 |
Retractable cover for an opening having limited stacking space |
August 9, 1988 |
| A retractable cover for closing an opening in a substantially flat surface. The cover has particular application for closing the oil change pit in the floor of a vehicle service facility. The cover comprises a plurality of stacked flat members, each of the flat members being provided wit |
| 4755004 |
Rotary rocksaw device |
July 5, 1988 |
| A rocksaw device for trenching through hard rock or rocky soil comprising a disc having a mounting base positioned therearound. The mounting base may comprise a plurality of base sections each formed in the shape of a section of a toroid generated by a planar closed curve rotated around |
| 4626032 |
Rock ditcher |
December 2, 1986 |
| Apparatus for excavating hard soils comprising support means, an endless chain capable of movement relative to said support means, drive means for moving said endless chain, means integral with said endless chain operable to contact said hard soils, and means for concentrating the force |
| 4333537 |
Impact drilling tool having improved valving |
June 8, 1982 |
| The device described contains a pneumatically operated hammer, a feeder controlling the flow of pneumatic fluid, an anvil which is struck repeatedly by the hammer, a drill bit attached to or integral with the lower end of the anvil, and an outer casing. The device is typically used a |
| 4290578 |
Failsafe cutoff valve for oil and gas wells |
September 22, 1981 |
| A failsafe cutoff valve that may be used with oil and gas wells is shown. A cylindrical body portion has a center bore extending longitudinally therethrough. A piston is located inside of the center bore. The cylindrical body portion has crossbores along a straight line that perpendi |
| 4096917 |
Earth drilling knobby bit |
June 27, 1978 |
| A partially solid head bit having a flow passage therethrough located at approximately the center of the bit is shown. The bit is designed for use in conjunction with a hammer action drilling apparatus. The flow passage extends through a shank of the bit to the bottom thereof. Surroundin |
| 4044844 |
Impact drilling tool |
August 30, 1977 |
| A fluid operated impact drilling tool has a hammer slidably mounted in a casing connected to a string of drilling pipe. Inside the casing above the hammer is mounted a valve. Both the valve and hammer have reciprocal sliding movement along the longitudinal axis of the tool to substantial |
| 4034816 |
Demolition tool |
July 12, 1977 |
| The present invention is a projectile type demolition tool. A projectile with an enlarged upper cross-sectional area is slideably mounted within and extendable from an inner cylinder. The lower portion of the projectile is extendable through a guide connected to the bottom of the inner |
| 3970152 |
Mud actuated drilling tool |
July 20, 1976 |
| A fluid operated impact drilling device wherein a hammer is mounted in a casing for axial reciprocating movement and drilling fluid flows through the hammer. The flow of drilling fluid is controlled by a valve element at the upper portion of the hammer. Differential pressure areas are pr |
