Patents by Inventor Harold Frederick Adshead

Harold Frederick Adshead has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6419047
    Abstract: A ladder is provided which has considerably reduced tendency to slip. Typically, the ladder 1 has rungs 5 and side members 2 with end caps 3 resting on the ground 4. Securing member 6, made typically from aluminium alloy, has friction member 7 provided with spikes 16. Pivot member 8 on the securing member 6 is fixed at one end on the securing member to opposite sides of the securing member, and at the other end is mounted through bolt 9 to the side member of the ladder. Flat spring 17 is fitted around the bolts 9, the spring being biassed to bring the securing member 6 against the side member 2. The pivot member is arcuate in shape to allow the securing member, when not in use to be positioned essentially flat against the ladder and not proud of the lower end of the side member. In use, the ladder is placed on the ground and against a wall. The securing member is pivoted against the bias of spring 17 so as to place it on the ground.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: July 16, 2002
    Inventor: Harold Frederick Adshead
  • Patent number: 6419045
    Abstract: An apparatus is provided for a portable ladder which has essentially parallel side members, the apparatus comprising having a pair of arcuate arms for attachment to the upper end of each side member of the ladder, at least one resilient roller mounted on a corresponding axle or axles located between and/or outwardly from the arms, a mechanism to locate each arm on each side member and a mechanism to secure the arms to the side member, the width of the roller being at least 50% of the distance between the arms. Also provided is a ladder fitted with the above apparatus. A ladder fitted with the apparatus enables easier working for a workman working at the top of the ladder and reduces possible damage to the surface on which the top of the ladder rests.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: July 16, 2002
    Inventor: Harold Frederick Adshead
  • Publication number: 20010013445
    Abstract: An apparatus is provided for a portable ladder which has essentially parallel side members, the apparatus comprising having a pair of arcuate arms for attachment to the upper end of each side member of the ladder, at least one resilient roller mounted on a corresponding axle or axles located between and/or outwardly from the arms, means to locate each arm on each side member and means to secure the arms to the side member, the width of the roller being at least 50% of the distance between the arms. Also provided is a ladder fitted with the above apparatus. A ladder fitted with the apparatus enables easier working for a workman working at the top of the ladder and reduces possible damage to the surface on which the top of the ladder rests.
    Type: Application
    Filed: January 8, 2001
    Publication date: August 16, 2001
    Inventor: Harold Frederick Adshead